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Finding the Fourth Proportional to 772.18, 1,156.44 and 424.99

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Solution

The fourth proportional to 772.18, 1,156.44 and 424.99 is: 636.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.18 : 1,156.44 = 424.99 : x
  2. Step 2: Convert to fraction form
    772.18/1,156.44 = 424.99/x
  3. Step 3: Cross multiply
    772.18x = 1,156.44 × 424.99
  4. Step 4: Simplify right side
    772.18x = 491,478.47
  5. Step 5: Solve for x
    x = 491,478.47/772.18
  6. Step 6: Final answer
    x = 636.48

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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.