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Finding the Fourth Proportional to 738.74, 1,108.76 and 430.16

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Solution

The fourth proportional to 738.74, 1,108.76 and 430.16 is: 645.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    738.74 : 1,108.76 = 430.16 : x
  2. Step 2: Convert to fraction form
    738.74/1,108.76 = 430.16/x
  3. Step 3: Cross multiply
    738.74x = 1,108.76 × 430.16
  4. Step 4: Simplify right side
    738.74x = 476,942.74
  5. Step 5: Solve for x
    x = 476,942.74/738.74
  6. Step 6: Final answer
    x = 645.62

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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.