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Finding the Fourth Proportional to 15,711.40, 21,681.88 and 8,637.88

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Solution

The fourth proportional to 15,711.40, 21,681.88 and 8,637.88 is: 11,920.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,711.40 : 21,681.88 = 8,637.88 : x
  2. Step 2: Convert to fraction form
    15,711.40/21,681.88 = 8,637.88/x
  3. Step 3: Cross multiply
    15,711.40x = 21,681.88 × 8,637.88
  4. Step 4: Simplify right side
    15,711.40x = 187,285,477.61
  5. Step 5: Solve for x
    x = 187,285,477.61/15,711.40
  6. Step 6: Final answer
    x = 11,920.36

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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.