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Finding the Fourth Proportional to 18,931.95, 28,356.57 and 15,607.71

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Solution

The fourth proportional to 18,931.95, 28,356.57 and 15,607.71 is: 23,377.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,931.95 : 28,356.57 = 15,607.71 : x
  2. Step 2: Convert to fraction form
    18,931.95/28,356.57 = 15,607.71/x
  3. Step 3: Cross multiply
    18,931.95x = 28,356.57 × 15,607.71
  4. Step 4: Simplify right side
    18,931.95x = 442,581,121.15
  5. Step 5: Solve for x
    x = 442,581,121.15/18,931.95
  6. Step 6: Final answer
    x = 23,377.47

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.