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Finding the Fourth Proportional to 772.28, 1,158.86 and 407.40

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Solution

The fourth proportional to 772.28, 1,158.86 and 407.40 is: 611.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.28 : 1,158.86 = 407.40 : x
  2. Step 2: Convert to fraction form
    772.28/1,158.86 = 407.40/x
  3. Step 3: Cross multiply
    772.28x = 1,158.86 × 407.40
  4. Step 4: Simplify right side
    772.28x = 472,119.56
  5. Step 5: Solve for x
    x = 472,119.56/772.28
  6. Step 6: Final answer
    x = 611.33

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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.