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Finding the Fourth Proportional to 91,421.70, 137,132.55 and 79,757.70

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Solution

The fourth proportional to 91,421.70, 137,132.55 and 79,757.70 is: 119,636.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,421.70 : 137,132.55 = 79,757.70 : x
  2. Step 2: Convert to fraction form
    91,421.70/137,132.55 = 79,757.70/x
  3. Step 3: Cross multiply
    91,421.70x = 137,132.55 × 79,757.70
  4. Step 4: Simplify right side
    91,421.70x = 10,937,376,783.14
  5. Step 5: Solve for x
    x = 10,937,376,783.14/91,421.70
  6. Step 6: Final answer
    x = 119,636.55

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1.5x scale

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.