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Finding the Fourth Proportional to 891.80, 1,337.70 and 405.32

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Solution

The fourth proportional to 891.80, 1,337.70 and 405.32 is: 607.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.80 : 1,337.70 = 405.32 : x
  2. Step 2: Convert to fraction form
    891.80/1,337.70 = 405.32/x
  3. Step 3: Cross multiply
    891.80x = 1,337.70 × 405.32
  4. Step 4: Simplify right side
    891.80x = 542,196.56
  5. Step 5: Solve for x
    x = 542,196.56/891.80
  6. Step 6: Final answer
    x = 607.98

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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.