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Finding the Fourth Proportional to 690.64, 1,035.84 and 382.80

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Solution

The fourth proportional to 690.64, 1,035.84 and 382.80 is: 574.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.64 : 1,035.84 = 382.80 : x
  2. Step 2: Convert to fraction form
    690.64/1,035.84 = 382.80/x
  3. Step 3: Cross multiply
    690.64x = 1,035.84 × 382.80
  4. Step 4: Simplify right side
    690.64x = 396,519.55
  5. Step 5: Solve for x
    x = 396,519.55/690.64
  6. Step 6: Final answer
    x = 574.13

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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.