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Finding the Fourth Proportional to 740.81, 1,111.01 and 278.43

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Solution

The fourth proportional to 740.81, 1,111.01 and 278.43 is: 417.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.81 : 1,111.01 = 278.43 : x
  2. Step 2: Convert to fraction form
    740.81/1,111.01 = 278.43/x
  3. Step 3: Cross multiply
    740.81x = 1,111.01 × 278.43
  4. Step 4: Simplify right side
    740.81x = 309,337.12
  5. Step 5: Solve for x
    x = 309,337.12/740.81
  6. Step 6: Final answer
    x = 417.57

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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.