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Finding the Fourth Proportional to 980.61, 1,353.02 and 631.23

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Solution

The fourth proportional to 980.61, 1,353.02 and 631.23 is: 870.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.61 : 1,353.02 = 631.23 : x
  2. Step 2: Convert to fraction form
    980.61/1,353.02 = 631.23/x
  3. Step 3: Cross multiply
    980.61x = 1,353.02 × 631.23
  4. Step 4: Simplify right side
    980.61x = 854,063.66
  5. Step 5: Solve for x
    x = 854,063.66/980.61
  6. Step 6: Final answer
    x = 870.95

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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.