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Finding the Fourth Proportional to 690.50, 1,034.94 and 382.19

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Solution

The fourth proportional to 690.50, 1,034.94 and 382.19 is: 572.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.50 : 1,034.94 = 382.19 : x
  2. Step 2: Convert to fraction form
    690.50/1,034.94 = 382.19/x
  3. Step 3: Cross multiply
    690.50x = 1,034.94 × 382.19
  4. Step 4: Simplify right side
    690.50x = 395,543.72
  5. Step 5: Solve for x
    x = 395,543.72/690.50
  6. Step 6: Final answer
    x = 572.84

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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.