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Finding the Fourth Proportional to 980.25, 1,353.56 and 631.55

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Solution

The fourth proportional to 980.25, 1,353.56 and 631.55 is: 872.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.25 : 1,353.56 = 631.55 : x
  2. Step 2: Convert to fraction form
    980.25/1,353.56 = 631.55/x
  3. Step 3: Cross multiply
    980.25x = 1,353.56 × 631.55
  4. Step 4: Simplify right side
    980.25x = 854,830.89
  5. Step 5: Solve for x
    x = 854,830.89/980.25
  6. Step 6: Final answer
    x = 872.05

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Double scale
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1.5x scale

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.