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Finding the Fourth Proportional to 78,508.99, 108,342.92 and 42,699.26

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Solution

The fourth proportional to 78,508.99, 108,342.92 and 42,699.26 is: 58,925.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,508.99 : 108,342.92 = 42,699.26 : x
  2. Step 2: Convert to fraction form
    78,508.99/108,342.92 = 42,699.26/x
  3. Step 3: Cross multiply
    78,508.99x = 108,342.92 × 42,699.26
  4. Step 4: Simplify right side
    78,508.99x = 4,626,162,767.75
  5. Step 5: Solve for x
    x = 4,626,162,767.75/78,508.99
  6. Step 6: Final answer
    x = 58,925.26

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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.