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Finding the Fourth Proportional to 998.95, 1,376.66 and 718.69

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Solution

The fourth proportional to 998.95, 1,376.66 and 718.69 is: 990.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.95 : 1,376.66 = 718.69 : x
  2. Step 2: Convert to fraction form
    998.95/1,376.66 = 718.69/x
  3. Step 3: Cross multiply
    998.95x = 1,376.66 × 718.69
  4. Step 4: Simplify right side
    998.95x = 989,391.78
  5. Step 5: Solve for x
    x = 989,391.78/998.95
  6. Step 6: Final answer
    x = 990.43

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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.