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Finding the Fourth Proportional to 8,761.68, 12,090 and 5,225.76

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Solution

The fourth proportional to 8,761.68, 12,090 and 5,225.76 is: 7,210.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,761.68 : 12,090 = 5,225.76 : x
  2. Step 2: Convert to fraction form
    8,761.68/12,090 = 5,225.76/x
  3. Step 3: Cross multiply
    8,761.68x = 12,090 × 5,225.76
  4. Step 4: Simplify right side
    8,761.68x = 63,179,438.40
  5. Step 5: Solve for x
    x = 63,179,438.40/8,761.68
  6. Step 6: Final answer
    x = 7,210.88

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.