Home / 15,711.42-21,681.19-8,637.78

Finding the Fourth Proportional to 15,711.42, 21,681.19 and 8,637.78

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Solution

The fourth proportional to 15,711.42, 21,681.19 and 8,637.78 is: 11,919.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,711.42 : 21,681.19 = 8,637.78 : x
  2. Step 2: Convert to fraction form
    15,711.42/21,681.19 = 8,637.78/x
  3. Step 3: Cross multiply
    15,711.42x = 21,681.19 × 8,637.78
  4. Step 4: Simplify right side
    15,711.42x = 187,277,349.36
  5. Step 5: Solve for x
    x = 187,277,349.36/15,711.42
  6. Step 6: Final answer
    x = 11,919.82

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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.