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Finding the Fourth Proportional to 782.90, 1,175.70 and 758.60

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Solution

The fourth proportional to 782.90, 1,175.70 and 758.60 is: 1,139.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.90 : 1,175.70 = 758.60 : x
  2. Step 2: Convert to fraction form
    782.90/1,175.70 = 758.60/x
  3. Step 3: Cross multiply
    782.90x = 1,175.70 × 758.60
  4. Step 4: Simplify right side
    782.90x = 891,886.02
  5. Step 5: Solve for x
    x = 891,886.02/782.90
  6. Step 6: Final answer
    x = 1,139.21

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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.