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Finding the Fourth Proportional to 124,389.60, 171,657.90 and 81,398.58

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Solution

The fourth proportional to 124,389.60, 171,657.90 and 81,398.58 is: 112,330.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    124,389.60 : 171,657.90 = 81,398.58 : x
  2. Step 2: Convert to fraction form
    124,389.60/171,657.90 = 81,398.58/x
  3. Step 3: Cross multiply
    124,389.60x = 171,657.90 × 81,398.58
  4. Step 4: Simplify right side
    124,389.60x = 13,972,709,305.78
  5. Step 5: Solve for x
    x = 13,972,709,305.78/124,389.60
  6. Step 6: Final answer
    x = 112,330.21

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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.