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Finding the Fourth Proportional to 750.12, 1,125.30 and 493.80

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Solution

The fourth proportional to 750.12, 1,125.30 and 493.80 is: 740.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    750.12 : 1,125.30 = 493.80 : x
  2. Step 2: Convert to fraction form
    750.12/1,125.30 = 493.80/x
  3. Step 3: Cross multiply
    750.12x = 1,125.30 × 493.80
  4. Step 4: Simplify right side
    750.12x = 555,673.14
  5. Step 5: Solve for x
    x = 555,673.14/750.12
  6. Step 6: Final answer
    x = 740.78

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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.