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Finding the Fourth Proportional to 690.61, 1,034.16 and 382.13

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Solution

The fourth proportional to 690.61, 1,034.16 and 382.13 is: 572.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.61 : 1,034.16 = 382.13 : x
  2. Step 2: Convert to fraction form
    690.61/1,034.16 = 382.13/x
  3. Step 3: Cross multiply
    690.61x = 1,034.16 × 382.13
  4. Step 4: Simplify right side
    690.61x = 395,183.56
  5. Step 5: Solve for x
    x = 395,183.56/690.61
  6. Step 6: Final answer
    x = 572.22

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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.