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Finding the Fourth Proportional to 7,191.60, 10,776.87 and 5,115.60

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Solution

The fourth proportional to 7,191.60, 10,776.87 and 5,115.60 is: 7,665.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,191.60 : 10,776.87 = 5,115.60 : x
  2. Step 2: Convert to fraction form
    7,191.60/10,776.87 = 5,115.60/x
  3. Step 3: Cross multiply
    7,191.60x = 10,776.87 × 5,115.60
  4. Step 4: Simplify right side
    7,191.60x = 55,130,156.17
  5. Step 5: Solve for x
    x = 55,130,156.17/7,191.60
  6. Step 6: Final answer
    x = 7,665.91

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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.