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Finding the Fourth Proportional to 938.74, 1,296.70 and 720.39

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Solution

The fourth proportional to 938.74, 1,296.70 and 720.39 is: 995.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.74 : 1,296.70 = 720.39 : x
  2. Step 2: Convert to fraction form
    938.74/1,296.70 = 720.39/x
  3. Step 3: Cross multiply
    938.74x = 1,296.70 × 720.39
  4. Step 4: Simplify right side
    938.74x = 934,129.71
  5. Step 5: Solve for x
    x = 934,129.71/938.74
  6. Step 6: Final answer
    x = 995.09

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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.