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Finding the Fourth Proportional to 738.74, 1,107.76 and 430.66

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Solution

The fourth proportional to 738.74, 1,107.76 and 430.66 is: 645.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    738.74 : 1,107.76 = 430.66 : x
  2. Step 2: Convert to fraction form
    738.74/1,107.76 = 430.66/x
  3. Step 3: Cross multiply
    738.74x = 1,107.76 × 430.66
  4. Step 4: Simplify right side
    738.74x = 477,067.92
  5. Step 5: Solve for x
    x = 477,067.92/738.74
  6. Step 6: Final answer
    x = 645.79

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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.