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Finding the Fourth Proportional to 81,297, 112,126.95 and 62,129.16

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Solution

The fourth proportional to 81,297, 112,126.95 and 62,129.16 is: 85,690.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,297 : 112,126.95 = 62,129.16 : x
  2. Step 2: Convert to fraction form
    81,297/112,126.95 = 62,129.16/x
  3. Step 3: Cross multiply
    81,297x = 112,126.95 × 62,129.16
  4. Step 4: Simplify right side
    81,297x = 6,966,353,216.86
  5. Step 5: Solve for x
    x = 6,966,353,216.86/81,297
  6. Step 6: Final answer
    x = 85,690.16

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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.