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Finding the Fourth Proportional to 90,464.80, 135,697.20 and 86,625.40

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Solution

The fourth proportional to 90,464.80, 135,697.20 and 86,625.40 is: 129,938.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,464.80 : 135,697.20 = 86,625.40 : x
  2. Step 2: Convert to fraction form
    90,464.80/135,697.20 = 86,625.40/x
  3. Step 3: Cross multiply
    90,464.80x = 135,697.20 × 86,625.40
  4. Step 4: Simplify right side
    90,464.80x = 11,754,824,228.88
  5. Step 5: Solve for x
    x = 11,754,824,228.88/90,464.80
  6. Step 6: Final answer
    x = 129,938.10

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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.