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Finding the Fourth Proportional to 939.96, 1,296.60 and 718.20

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Solution

The fourth proportional to 939.96, 1,296.60 and 718.20 is: 990.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.96 : 1,296.60 = 718.20 : x
  2. Step 2: Convert to fraction form
    939.96/1,296.60 = 718.20/x
  3. Step 3: Cross multiply
    939.96x = 1,296.60 × 718.20
  4. Step 4: Simplify right side
    939.96x = 931,218.12
  5. Step 5: Solve for x
    x = 931,218.12/939.96
  6. Step 6: Final answer
    x = 990.70

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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.