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Finding the Fourth Proportional to 91,290.60, 136,667.10 and 68,020.20

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Solution

The fourth proportional to 91,290.60, 136,667.10 and 68,020.20 is: 101,830.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,290.60 : 136,667.10 = 68,020.20 : x
  2. Step 2: Convert to fraction form
    91,290.60/136,667.10 = 68,020.20/x
  3. Step 3: Cross multiply
    91,290.60x = 136,667.10 × 68,020.20
  4. Step 4: Simplify right side
    91,290.60x = 9,296,123,475.42
  5. Step 5: Solve for x
    x = 9,296,123,475.42/91,290.60
  6. Step 6: Final answer
    x = 101,830.02

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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.