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Finding the Fourth Proportional to 10,391.87, 15,591.45 and 5,391.85

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Solution

The fourth proportional to 10,391.87, 15,591.45 and 5,391.85 is: 8,089.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,391.87 : 15,591.45 = 5,391.85 : x
  2. Step 2: Convert to fraction form
    10,391.87/15,591.45 = 5,391.85/x
  3. Step 3: Cross multiply
    10,391.87x = 15,591.45 × 5,391.85
  4. Step 4: Simplify right side
    10,391.87x = 84,066,681.73
  5. Step 5: Solve for x
    x = 84,066,681.73/10,391.87
  6. Step 6: Final answer
    x = 8,089.66

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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.