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Finding the Fourth Proportional to 1,074.72, 1,612.67 and 425.91

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Solution

The fourth proportional to 1,074.72, 1,612.67 and 425.91 is: 639.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,074.72 : 1,612.67 = 425.91 : x
  2. Step 2: Convert to fraction form
    1,074.72/1,612.67 = 425.91/x
  3. Step 3: Cross multiply
    1,074.72x = 1,612.67 × 425.91
  4. Step 4: Simplify right side
    1,074.72x = 686,850.15
  5. Step 5: Solve for x
    x = 686,850.15/1,074.72
  6. Step 6: Final answer
    x = 639.10

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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.