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Finding the Fourth Proportional to 740.81, 1,111.36 and 254.20

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Solution

The fourth proportional to 740.81, 1,111.36 and 254.20 is: 381.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.81 : 1,111.36 = 254.20 : x
  2. Step 2: Convert to fraction form
    740.81/1,111.36 = 254.20/x
  3. Step 3: Cross multiply
    740.81x = 1,111.36 × 254.20
  4. Step 4: Simplify right side
    740.81x = 282,507.71
  5. Step 5: Solve for x
    x = 282,507.71/740.81
  6. Step 6: Final answer
    x = 381.35

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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.