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Finding the Fourth Proportional to 988.20, 1,363.20 and 615.12

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Solution

The fourth proportional to 988.20, 1,363.20 and 615.12 is: 848.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.20 : 1,363.20 = 615.12 : x
  2. Step 2: Convert to fraction form
    988.20/1,363.20 = 615.12/x
  3. Step 3: Cross multiply
    988.20x = 1,363.20 × 615.12
  4. Step 4: Simplify right side
    988.20x = 838,531.58
  5. Step 5: Solve for x
    x = 838,531.58/988.20
  6. Step 6: Final answer
    x = 848.54

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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.