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Finding the Fourth Proportional to 30,715.50, 42,356.07 and 28,929.90

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Solution

The fourth proportional to 30,715.50, 42,356.07 and 28,929.90 is: 39,893.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,715.50 : 42,356.07 = 28,929.90 : x
  2. Step 2: Convert to fraction form
    30,715.50/42,356.07 = 28,929.90/x
  3. Step 3: Cross multiply
    30,715.50x = 42,356.07 × 28,929.90
  4. Step 4: Simplify right side
    30,715.50x = 1,225,356,869.49
  5. Step 5: Solve for x
    x = 1,225,356,869.49/30,715.50
  6. Step 6: Final answer
    x = 39,893.76

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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.