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Finding the Fourth Proportional to 112,776.76, 155,631.92 and 61,791.42

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Solution

The fourth proportional to 112,776.76, 155,631.92 and 61,791.42 is: 85,272.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    112,776.76 : 155,631.92 = 61,791.42 : x
  2. Step 2: Convert to fraction form
    112,776.76/155,631.92 = 61,791.42/x
  3. Step 3: Cross multiply
    112,776.76x = 155,631.92 × 61,791.42
  4. Step 4: Simplify right side
    112,776.76x = 9,616,717,334.13
  5. Step 5: Solve for x
    x = 9,616,717,334.13/112,776.76
  6. Step 6: Final answer
    x = 85,272.15

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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.