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Finding the Fourth Proportional to 875.64, 1,311.30 and 669.90

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Solution

The fourth proportional to 875.64, 1,311.30 and 669.90 is: 1,003.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.64 : 1,311.30 = 669.90 : x
  2. Step 2: Convert to fraction form
    875.64/1,311.30 = 669.90/x
  3. Step 3: Cross multiply
    875.64x = 1,311.30 × 669.90
  4. Step 4: Simplify right side
    875.64x = 878,439.87
  5. Step 5: Solve for x
    x = 878,439.87/875.64
  6. Step 6: Final answer
    x = 1,003.20

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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.