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Finding the Fourth Proportional to 782.88, 1,174.32 and 418.08

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Solution

The fourth proportional to 782.88, 1,174.32 and 418.08 is: 627.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.88 : 1,174.32 = 418.08 : x
  2. Step 2: Convert to fraction form
    782.88/1,174.32 = 418.08/x
  3. Step 3: Cross multiply
    782.88x = 1,174.32 × 418.08
  4. Step 4: Simplify right side
    782.88x = 490,959.71
  5. Step 5: Solve for x
    x = 490,959.71/782.88
  6. Step 6: Final answer
    x = 627.12

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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.