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Finding the Fourth Proportional to 740.75, 1,111.28 and 253.79

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Solution

The fourth proportional to 740.75, 1,111.28 and 253.79 is: 380.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.75 : 1,111.28 = 253.79 : x
  2. Step 2: Convert to fraction form
    740.75/1,111.28 = 253.79/x
  3. Step 3: Cross multiply
    740.75x = 1,111.28 × 253.79
  4. Step 4: Simplify right side
    740.75x = 282,024.93
  5. Step 5: Solve for x
    x = 282,024.93/740.75
  6. Step 6: Final answer
    x = 380.73

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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.