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Finding the Fourth Proportional to 875.21, 1,311.87 and 442.40

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Solution

The fourth proportional to 875.21, 1,311.87 and 442.40 is: 663.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.21 : 1,311.87 = 442.40 : x
  2. Step 2: Convert to fraction form
    875.21/1,311.87 = 442.40/x
  3. Step 3: Cross multiply
    875.21x = 1,311.87 × 442.40
  4. Step 4: Simplify right side
    875.21x = 580,371.29
  5. Step 5: Solve for x
    x = 580,371.29/875.21
  6. Step 6: Final answer
    x = 663.12

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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.