Home / 15,711.85-21,681.80-8,638.22

Finding the Fourth Proportional to 15,711.85, 21,681.80 and 8,638.22

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Solution

The fourth proportional to 15,711.85, 21,681.80 and 8,638.22 is: 11,920.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,711.85 : 21,681.80 = 8,638.22 : x
  2. Step 2: Convert to fraction form
    15,711.85/21,681.80 = 8,638.22/x
  3. Step 3: Cross multiply
    15,711.85x = 21,681.80 × 8,638.22
  4. Step 4: Simplify right side
    15,711.85x = 187,292,158.40
  5. Step 5: Solve for x
    x = 187,292,158.40/15,711.85
  6. Step 6: Final answer
    x = 11,920.44

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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.