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Finding the Fourth Proportional to 891.88, 1,337.55 and 405.07

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Solution

The fourth proportional to 891.88, 1,337.55 and 405.07 is: 607.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.88 : 1,337.55 = 405.07 : x
  2. Step 2: Convert to fraction form
    891.88/1,337.55 = 405.07/x
  3. Step 3: Cross multiply
    891.88x = 1,337.55 × 405.07
  4. Step 4: Simplify right side
    891.88x = 541,801.38
  5. Step 5: Solve for x
    x = 541,801.38/891.88
  6. Step 6: Final answer
    x = 607.48

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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.