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Finding the Fourth Proportional to 740.71, 1,111.20 and 254.08

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Solution

The fourth proportional to 740.71, 1,111.20 and 254.08 is: 381.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.71 : 1,111.20 = 254.08 : x
  2. Step 2: Convert to fraction form
    740.71/1,111.20 = 254.08/x
  3. Step 3: Cross multiply
    740.71x = 1,111.20 × 254.08
  4. Step 4: Simplify right side
    740.71x = 282,333.70
  5. Step 5: Solve for x
    x = 282,333.70/740.71
  6. Step 6: Final answer
    x = 381.17

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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.