Home / 15,711.69-21,682.10-8,638.23

Finding the Fourth Proportional to 15,711.69, 21,682.10 and 8,638.23

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Solution

The fourth proportional to 15,711.69, 21,682.10 and 8,638.23 is: 11,920.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,711.69 : 21,682.10 = 8,638.23 : x
  2. Step 2: Convert to fraction form
    15,711.69/21,682.10 = 8,638.23/x
  3. Step 3: Cross multiply
    15,711.69x = 21,682.10 × 8,638.23
  4. Step 4: Simplify right side
    15,711.69x = 187,294,923.49
  5. Step 5: Solve for x
    x = 187,294,923.49/15,711.69
  6. Step 6: Final answer
    x = 11,920.74

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Half scale
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Double scale
Find fourth proportional to 15,712.69, 21,683.47 and 8,639.23
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.