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Finding the Fourth Proportional to 1,487.21, 2,229.16 and 755.28

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Solution

The fourth proportional to 1,487.21, 2,229.16 and 755.28 is: 1,132.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,487.21 : 2,229.16 = 755.28 : x
  2. Step 2: Convert to fraction form
    1,487.21/2,229.16 = 755.28/x
  3. Step 3: Cross multiply
    1,487.21x = 2,229.16 × 755.28
  4. Step 4: Simplify right side
    1,487.21x = 1,683,625.04
  5. Step 5: Solve for x
    x = 1,683,625.04/1,487.21
  6. Step 6: Final answer
    x = 1,132.07

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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.