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Finding the Fourth Proportional to 740.80, 1,110.99 and 253.79

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Solution

The fourth proportional to 740.80, 1,110.99 and 253.79 is: 380.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.80 : 1,110.99 = 253.79 : x
  2. Step 2: Convert to fraction form
    740.80/1,110.99 = 253.79/x
  3. Step 3: Cross multiply
    740.80x = 1,110.99 × 253.79
  4. Step 4: Simplify right side
    740.80x = 281,952.60
  5. Step 5: Solve for x
    x = 281,952.60/740.80
  6. Step 6: Final answer
    x = 380.61

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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.