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Finding the Fourth Proportional to 90,642.86, 125,128.95 and 54,361.58

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Solution

The fourth proportional to 90,642.86, 125,128.95 and 54,361.58 is: 75,044.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,642.86 : 125,128.95 = 54,361.58 : x
  2. Step 2: Convert to fraction form
    90,642.86/125,128.95 = 54,361.58/x
  3. Step 3: Cross multiply
    90,642.86x = 125,128.95 × 54,361.58
  4. Step 4: Simplify right side
    90,642.86x = 6,802,207,425.74
  5. Step 5: Solve for x
    x = 6,802,207,425.74/90,642.86
  6. Step 6: Final answer
    x = 75,044.05

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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.