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Finding the Fourth Proportional to 875.80, 1,311.90 and 442

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Solution

The fourth proportional to 875.80, 1,311.90 and 442 is: 662.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.80 : 1,311.90 = 442 : x
  2. Step 2: Convert to fraction form
    875.80/1,311.90 = 442/x
  3. Step 3: Cross multiply
    875.80x = 1,311.90 × 442
  4. Step 4: Simplify right side
    875.80x = 579,859.80
  5. Step 5: Solve for x
    x = 579,859.80/875.80
  6. Step 6: Final answer
    x = 662.09

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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.