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Finding the Fourth Proportional to 91,421.40, 136,864.80 and 65,177.40

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Solution

The fourth proportional to 91,421.40, 136,864.80 and 65,177.40 is: 97,575.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,421.40 : 136,864.80 = 65,177.40 : x
  2. Step 2: Convert to fraction form
    91,421.40/136,864.80 = 65,177.40/x
  3. Step 3: Cross multiply
    91,421.40x = 136,864.80 × 65,177.40
  4. Step 4: Simplify right side
    91,421.40x = 8,920,491,815.52
  5. Step 5: Solve for x
    x = 8,920,491,815.52/91,421.40
  6. Step 6: Final answer
    x = 97,575.53

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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.