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Finding the Fourth Proportional to 78,360.56, 108,134.60 and 42,549.78

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Solution

The fourth proportional to 78,360.56, 108,134.60 and 42,549.78 is: 58,717.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,360.56 : 108,134.60 = 42,549.78 : x
  2. Step 2: Convert to fraction form
    78,360.56/108,134.60 = 42,549.78/x
  3. Step 3: Cross multiply
    78,360.56x = 108,134.60 × 42,549.78
  4. Step 4: Simplify right side
    78,360.56x = 4,601,103,227.64
  5. Step 5: Solve for x
    x = 4,601,103,227.64/78,360.56
  6. Step 6: Final answer
    x = 58,717.08

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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.