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Finding the Fourth Proportional to 939.40, 1,407.28 and 573.12

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Solution

The fourth proportional to 939.40, 1,407.28 and 573.12 is: 858.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.40 : 1,407.28 = 573.12 : x
  2. Step 2: Convert to fraction form
    939.40/1,407.28 = 573.12/x
  3. Step 3: Cross multiply
    939.40x = 1,407.28 × 573.12
  4. Step 4: Simplify right side
    939.40x = 806,540.31
  5. Step 5: Solve for x
    x = 806,540.31/939.40
  6. Step 6: Final answer
    x = 858.57

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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.