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Finding the Fourth Proportional to 871.30, 1,305.04 and 505.18

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Solution

The fourth proportional to 871.30, 1,305.04 and 505.18 is: 756.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    871.30 : 1,305.04 = 505.18 : x
  2. Step 2: Convert to fraction form
    871.30/1,305.04 = 505.18/x
  3. Step 3: Cross multiply
    871.30x = 1,305.04 × 505.18
  4. Step 4: Simplify right side
    871.30x = 659,280.11
  5. Step 5: Solve for x
    x = 659,280.11/871.30
  6. Step 6: Final answer
    x = 756.66

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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.