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Finding the Fourth Proportional to 755.96, 1,127.49 and 641.16

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Solution

The fourth proportional to 755.96, 1,127.49 and 641.16 is: 956.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    755.96 : 1,127.49 = 641.16 : x
  2. Step 2: Convert to fraction form
    755.96/1,127.49 = 641.16/x
  3. Step 3: Cross multiply
    755.96x = 1,127.49 × 641.16
  4. Step 4: Simplify right side
    755.96x = 722,901.49
  5. Step 5: Solve for x
    x = 722,901.49/755.96
  6. Step 6: Final answer
    x = 956.27

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.