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Finding the Fourth Proportional to 78,948.66, 108,949.91 and 43,138.66

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Solution

The fourth proportional to 78,948.66, 108,949.91 and 43,138.66 is: 59,531.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,948.66 : 108,949.91 = 43,138.66 : x
  2. Step 2: Convert to fraction form
    78,948.66/108,949.91 = 43,138.66/x
  3. Step 3: Cross multiply
    78,948.66x = 108,949.91 × 43,138.66
  4. Step 4: Simplify right side
    78,948.66x = 4,699,953,124.52
  5. Step 5: Solve for x
    x = 4,699,953,124.52/78,948.66
  6. Step 6: Final answer
    x = 59,531.77

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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.