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Finding the Fourth Proportional to 927.57, 1,390.70 and 407.28

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Solution

The fourth proportional to 927.57, 1,390.70 and 407.28 is: 610.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.57 : 1,390.70 = 407.28 : x
  2. Step 2: Convert to fraction form
    927.57/1,390.70 = 407.28/x
  3. Step 3: Cross multiply
    927.57x = 1,390.70 × 407.28
  4. Step 4: Simplify right side
    927.57x = 566,402.26
  5. Step 5: Solve for x
    x = 566,402.26/927.57
  6. Step 6: Final answer
    x = 610.63

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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.