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Finding the Fourth Proportional to 888.20, 1,225.68 and 515.20

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Solution

The fourth proportional to 888.20, 1,225.68 and 515.20 is: 710.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    888.20 : 1,225.68 = 515.20 : x
  2. Step 2: Convert to fraction form
    888.20/1,225.68 = 515.20/x
  3. Step 3: Cross multiply
    888.20x = 1,225.68 × 515.20
  4. Step 4: Simplify right side
    888.20x = 631,470.34
  5. Step 5: Solve for x
    x = 631,470.34/888.20
  6. Step 6: Final answer
    x = 710.96

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.