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Finding the Fourth Proportional to 927.59, 1,391.12 and 407.84

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Solution

The fourth proportional to 927.59, 1,391.12 and 407.84 is: 611.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.59 : 1,391.12 = 407.84 : x
  2. Step 2: Convert to fraction form
    927.59/1,391.12 = 407.84/x
  3. Step 3: Cross multiply
    927.59x = 1,391.12 × 407.84
  4. Step 4: Simplify right side
    927.59x = 567,352.34
  5. Step 5: Solve for x
    x = 567,352.34/927.59
  6. Step 6: Final answer
    x = 611.64

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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.