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Finding the Fourth Proportional to 99,290.40, 148,935.60 and 91,687.20

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Solution

The fourth proportional to 99,290.40, 148,935.60 and 91,687.20 is: 137,530.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,290.40 : 148,935.60 = 91,687.20 : x
  2. Step 2: Convert to fraction form
    99,290.40/148,935.60 = 91,687.20/x
  3. Step 3: Cross multiply
    99,290.40x = 148,935.60 × 91,687.20
  4. Step 4: Simplify right side
    99,290.40x = 13,655,488,144.32
  5. Step 5: Solve for x
    x = 13,655,488,144.32/99,290.40
  6. Step 6: Final answer
    x = 137,530.80

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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.