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Finding the Fourth Proportional to 755.70, 1,132.20 and 647.70

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Solution

The fourth proportional to 755.70, 1,132.20 and 647.70 is: 970.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    755.70 : 1,132.20 = 647.70 : x
  2. Step 2: Convert to fraction form
    755.70/1,132.20 = 647.70/x
  3. Step 3: Cross multiply
    755.70x = 1,132.20 × 647.70
  4. Step 4: Simplify right side
    755.70x = 733,325.94
  5. Step 5: Solve for x
    x = 733,325.94/755.70
  6. Step 6: Final answer
    x = 970.39

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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.