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Finding the Fourth Proportional to 91,105.60, 136,530.40 and 72,417.60

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Solution

The fourth proportional to 91,105.60, 136,530.40 and 72,417.60 is: 108,524.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,105.60 : 136,530.40 = 72,417.60 : x
  2. Step 2: Convert to fraction form
    91,105.60/136,530.40 = 72,417.60/x
  3. Step 3: Cross multiply
    91,105.60x = 136,530.40 × 72,417.60
  4. Step 4: Simplify right side
    91,105.60x = 9,887,203,895.04
  5. Step 5: Solve for x
    x = 9,887,203,895.04/91,105.60
  6. Step 6: Final answer
    x = 108,524.66

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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.