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Finding the Fourth Proportional to 939.90, 1,409.91 and 593.53

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Solution

The fourth proportional to 939.90, 1,409.91 and 593.53 is: 890.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.90 : 1,409.91 = 593.53 : x
  2. Step 2: Convert to fraction form
    939.90/1,409.91 = 593.53/x
  3. Step 3: Cross multiply
    939.90x = 1,409.91 × 593.53
  4. Step 4: Simplify right side
    939.90x = 836,818.13
  5. Step 5: Solve for x
    x = 836,818.13/939.90
  6. Step 6: Final answer
    x = 890.32

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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.