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Finding the Fourth Proportional to 969.56, 1,337.52 and 638

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Solution

The fourth proportional to 969.56, 1,337.52 and 638 is: 880.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    969.56 : 1,337.52 = 638 : x
  2. Step 2: Convert to fraction form
    969.56/1,337.52 = 638/x
  3. Step 3: Cross multiply
    969.56x = 1,337.52 × 638
  4. Step 4: Simplify right side
    969.56x = 853,337.76
  5. Step 5: Solve for x
    x = 853,337.76/969.56
  6. Step 6: Final answer
    x = 880.13

Related Problems

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Half scale
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Double scale
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Similar ratio
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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.