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Finding the Fourth Proportional to 81,288.52, 112,216.52 and 61,153.09

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Solution

The fourth proportional to 81,288.52, 112,216.52 and 61,153.09 is: 84,420.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,288.52 : 112,216.52 = 61,153.09 : x
  2. Step 2: Convert to fraction form
    81,288.52/112,216.52 = 61,153.09/x
  3. Step 3: Cross multiply
    81,288.52x = 112,216.52 × 61,153.09
  4. Step 4: Simplify right side
    81,288.52x = 6,862,386,080.20
  5. Step 5: Solve for x
    x = 6,862,386,080.20/81,288.52
  6. Step 6: Final answer
    x = 84,420.11

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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.