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Finding the Fourth Proportional to 688.60, 1,033.08 and 380.72

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Solution

The fourth proportional to 688.60, 1,033.08 and 380.72 is: 571.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.60 : 1,033.08 = 380.72 : x
  2. Step 2: Convert to fraction form
    688.60/1,033.08 = 380.72/x
  3. Step 3: Cross multiply
    688.60x = 1,033.08 × 380.72
  4. Step 4: Simplify right side
    688.60x = 393,314.22
  5. Step 5: Solve for x
    x = 393,314.22/688.60
  6. Step 6: Final answer
    x = 571.18

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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.