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Finding the Fourth Proportional to 90,687.60, 136,078.65 and 43,356.06

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Solution

The fourth proportional to 90,687.60, 136,078.65 and 43,356.06 is: 65,056.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,687.60 : 136,078.65 = 43,356.06 : x
  2. Step 2: Convert to fraction form
    90,687.60/136,078.65 = 43,356.06/x
  3. Step 3: Cross multiply
    90,687.60x = 136,078.65 × 43,356.06
  4. Step 4: Simplify right side
    90,687.60x = 5,899,834,114.12
  5. Step 5: Solve for x
    x = 5,899,834,114.12/90,687.60
  6. Step 6: Final answer
    x = 65,056.68

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.