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Finding the Fourth Proportional to 81,290.32, 112,218.95 and 61,154.87

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Solution

The fourth proportional to 81,290.32, 112,218.95 and 61,154.87 is: 84,422.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,290.32 : 112,218.95 = 61,154.87 : x
  2. Step 2: Convert to fraction form
    81,290.32/112,218.95 = 61,154.87/x
  3. Step 3: Cross multiply
    81,290.32x = 112,218.95 × 61,154.87
  4. Step 4: Simplify right side
    81,290.32x = 6,862,734,890.58
  5. Step 5: Solve for x
    x = 6,862,734,890.58/81,290.32
  6. Step 6: Final answer
    x = 84,422.54

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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.