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Finding the Fourth Proportional to 740.38, 1,110.86 and 393.70

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Solution

The fourth proportional to 740.38, 1,110.86 and 393.70 is: 590.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.38 : 1,110.86 = 393.70 : x
  2. Step 2: Convert to fraction form
    740.38/1,110.86 = 393.70/x
  3. Step 3: Cross multiply
    740.38x = 1,110.86 × 393.70
  4. Step 4: Simplify right side
    740.38x = 437,345.58
  5. Step 5: Solve for x
    x = 437,345.58/740.38
  6. Step 6: Final answer
    x = 590.70

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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.