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Finding the Fourth Proportional to 750.90, 1,125.15 and 647.70

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Solution

The fourth proportional to 750.90, 1,125.15 and 647.70 is: 970.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    750.90 : 1,125.15 = 647.70 : x
  2. Step 2: Convert to fraction form
    750.90/1,125.15 = 647.70/x
  3. Step 3: Cross multiply
    750.90x = 1,125.15 × 647.70
  4. Step 4: Simplify right side
    750.90x = 728,759.66
  5. Step 5: Solve for x
    x = 728,759.66/750.90
  6. Step 6: Final answer
    x = 970.51

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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.