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Finding the Fourth Proportional to 891.99, 1,337.78 and 429.53

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Solution

The fourth proportional to 891.99, 1,337.78 and 429.53 is: 644.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.99 : 1,337.78 = 429.53 : x
  2. Step 2: Convert to fraction form
    891.99/1,337.78 = 429.53/x
  3. Step 3: Cross multiply
    891.99x = 1,337.78 × 429.53
  4. Step 4: Simplify right side
    891.99x = 574,621.06
  5. Step 5: Solve for x
    x = 574,621.06/891.99
  6. Step 6: Final answer
    x = 644.20

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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.