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Finding the Fourth Proportional to 888.21, 1,225.80 and 515.30

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Solution

The fourth proportional to 888.21, 1,225.80 and 515.30 is: 711.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    888.21 : 1,225.80 = 515.30 : x
  2. Step 2: Convert to fraction form
    888.21/1,225.80 = 515.30/x
  3. Step 3: Cross multiply
    888.21x = 1,225.80 × 515.30
  4. Step 4: Simplify right side
    888.21x = 631,648.61
  5. Step 5: Solve for x
    x = 631,648.61/888.21
  6. Step 6: Final answer
    x = 711.15

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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.