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Finding the Fourth Proportional to 755.57, 1,132.64 and 687.93

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Solution

The fourth proportional to 755.57, 1,132.64 and 687.93 is: 1,031.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    755.57 : 1,132.64 = 687.93 : x
  2. Step 2: Convert to fraction form
    755.57/1,132.64 = 687.93/x
  3. Step 3: Cross multiply
    755.57x = 1,132.64 × 687.93
  4. Step 4: Simplify right side
    755.57x = 779,173.60
  5. Step 5: Solve for x
    x = 779,173.60/755.57
  6. Step 6: Final answer
    x = 1,031.25

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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.