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Finding the Fourth Proportional to 939.53, 1,409.12 and 354.58

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Solution

The fourth proportional to 939.53, 1,409.12 and 354.58 is: 531.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.53 : 1,409.12 = 354.58 : x
  2. Step 2: Convert to fraction form
    939.53/1,409.12 = 354.58/x
  3. Step 3: Cross multiply
    939.53x = 1,409.12 × 354.58
  4. Step 4: Simplify right side
    939.53x = 499,643.13
  5. Step 5: Solve for x
    x = 499,643.13/939.53
  6. Step 6: Final answer
    x = 531.80

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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.