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Finding the Fourth Proportional to 888.19, 1,225.99 and 515.25

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Solution

The fourth proportional to 888.19, 1,225.99 and 515.25 is: 711.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    888.19 : 1,225.99 = 515.25 : x
  2. Step 2: Convert to fraction form
    888.19/1,225.99 = 515.25/x
  3. Step 3: Cross multiply
    888.19x = 1,225.99 × 515.25
  4. Step 4: Simplify right side
    888.19x = 631,691.99
  5. Step 5: Solve for x
    x = 631,691.99/888.19
  6. Step 6: Final answer
    x = 711.21

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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.