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Finding the Fourth Proportional to 750.36, 1,125.28 and 287.90

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Solution

The fourth proportional to 750.36, 1,125.28 and 287.90 is: 431.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    750.36 : 1,125.28 = 287.90 : x
  2. Step 2: Convert to fraction form
    750.36/1,125.28 = 287.90/x
  3. Step 3: Cross multiply
    750.36x = 1,125.28 × 287.90
  4. Step 4: Simplify right side
    750.36x = 323,961.77
  5. Step 5: Solve for x
    x = 323,961.77/750.36
  6. Step 6: Final answer
    x = 431.74

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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.