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Finding the Fourth Proportional to 998, 1,376.16 and 731.28

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Solution

The fourth proportional to 998, 1,376.16 and 731.28 is: 1,008.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    998 : 1,376.16 = 731.28 : x
  2. Step 2: Convert to fraction form
    998/1,376.16 = 731.28/x
  3. Step 3: Cross multiply
    998x = 1,376.16 × 731.28
  4. Step 4: Simplify right side
    998x = 1,006,358.28
  5. Step 5: Solve for x
    x = 1,006,358.28/998
  6. Step 6: Final answer
    x = 1,008.38

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.