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Finding the Fourth Proportional to 875.52, 1,311.84 and 631.44

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Solution

The fourth proportional to 875.52, 1,311.84 and 631.44 is: 946.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.52 : 1,311.84 = 631.44 : x
  2. Step 2: Convert to fraction form
    875.52/1,311.84 = 631.44/x
  3. Step 3: Cross multiply
    875.52x = 1,311.84 × 631.44
  4. Step 4: Simplify right side
    875.52x = 828,348.25
  5. Step 5: Solve for x
    x = 828,348.25/875.52
  6. Step 6: Final answer
    x = 946.12

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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.