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Finding the Fourth Proportional to 750.28, 1,125.64 and 385.33

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Solution

The fourth proportional to 750.28, 1,125.64 and 385.33 is: 578.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    750.28 : 1,125.64 = 385.33 : x
  2. Step 2: Convert to fraction form
    750.28/1,125.64 = 385.33/x
  3. Step 3: Cross multiply
    750.28x = 1,125.64 × 385.33
  4. Step 4: Simplify right side
    750.28x = 433,742.86
  5. Step 5: Solve for x
    x = 433,742.86/750.28
  6. Step 6: Final answer
    x = 578.11

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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.