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Finding the Fourth Proportional to 939.89, 1,407.78 and 573.56

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Solution

The fourth proportional to 939.89, 1,407.78 and 573.56 is: 859.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.89 : 1,407.78 = 573.56 : x
  2. Step 2: Convert to fraction form
    939.89/1,407.78 = 573.56/x
  3. Step 3: Cross multiply
    939.89x = 1,407.78 × 573.56
  4. Step 4: Simplify right side
    939.89x = 807,452.46
  5. Step 5: Solve for x
    x = 807,452.46/939.89
  6. Step 6: Final answer
    x = 859.10

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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.