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Finding the Fourth Proportional to 72,947.75, 109,411.90 and 20,362.55

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Solution

The fourth proportional to 72,947.75, 109,411.90 and 20,362.55 is: 30,541.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,947.75 : 109,411.90 = 20,362.55 : x
  2. Step 2: Convert to fraction form
    72,947.75/109,411.90 = 20,362.55/x
  3. Step 3: Cross multiply
    72,947.75x = 109,411.90 × 20,362.55
  4. Step 4: Simplify right side
    72,947.75x = 2,227,904,686.38
  5. Step 5: Solve for x
    x = 2,227,904,686.38/72,947.75
  6. Step 6: Final answer
    x = 30,541.10

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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.