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Finding the Fourth Proportional to 78,507.78, 108,342.78 and 42,699.90

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Solution

The fourth proportional to 78,507.78, 108,342.78 and 42,699.90 is: 58,926.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,507.78 : 108,342.78 = 42,699.90 : x
  2. Step 2: Convert to fraction form
    78,507.78/108,342.78 = 42,699.90/x
  3. Step 3: Cross multiply
    78,507.78x = 108,342.78 × 42,699.90
  4. Step 4: Simplify right side
    78,507.78x = 4,626,225,871.72
  5. Step 5: Solve for x
    x = 4,626,225,871.72/78,507.78
  6. Step 6: Final answer
    x = 58,926.97

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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.