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Finding the Fourth Proportional to 72,143.59, 99,557.95 and 40,312.52

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Solution

The fourth proportional to 72,143.59, 99,557.95 and 40,312.52 is: 55,631.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,143.59 : 99,557.95 = 40,312.52 : x
  2. Step 2: Convert to fraction form
    72,143.59/99,557.95 = 40,312.52/x
  3. Step 3: Cross multiply
    72,143.59x = 99,557.95 × 40,312.52
  4. Step 4: Simplify right side
    72,143.59x = 4,013,431,648.97
  5. Step 5: Solve for x
    x = 4,013,431,648.97/72,143.59
  6. Step 6: Final answer
    x = 55,631.16

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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.