Home / 15,711.69-21,681.59-8,638.06

Finding the Fourth Proportional to 15,711.69, 21,681.59 and 8,638.06

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Solution

The fourth proportional to 15,711.69, 21,681.59 and 8,638.06 is: 11,920.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,711.69 : 21,681.59 = 8,638.06 : x
  2. Step 2: Convert to fraction form
    15,711.69/21,681.59 = 8,638.06/x
  3. Step 3: Cross multiply
    15,711.69x = 21,681.59 × 8,638.06
  4. Step 4: Simplify right side
    15,711.69x = 187,286,875.32
  5. Step 5: Solve for x
    x = 187,286,875.32/15,711.69
  6. Step 6: Final answer
    x = 11,920.22

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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.