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Finding the Fourth Proportional to 74,160, 102,345.12 and 42,338.88

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Solution

The fourth proportional to 74,160, 102,345.12 and 42,338.88 is: 58,430.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,160 : 102,345.12 = 42,338.88 : x
  2. Step 2: Convert to fraction form
    74,160/102,345.12 = 42,338.88/x
  3. Step 3: Cross multiply
    74,160x = 102,345.12 × 42,338.88
  4. Step 4: Simplify right side
    74,160x = 4,333,177,754.27
  5. Step 5: Solve for x
    x = 4,333,177,754.27/74,160
  6. Step 6: Final answer
    x = 58,430.12

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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.