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Finding the Fourth Proportional to 740.78, 1,107.99 and 431.86

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Solution

The fourth proportional to 740.78, 1,107.99 and 431.86 is: 645.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.78 : 1,107.99 = 431.86 : x
  2. Step 2: Convert to fraction form
    740.78/1,107.99 = 431.86/x
  3. Step 3: Cross multiply
    740.78x = 1,107.99 × 431.86
  4. Step 4: Simplify right side
    740.78x = 478,496.56
  5. Step 5: Solve for x
    x = 478,496.56/740.78
  6. Step 6: Final answer
    x = 645.94

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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.