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Finding the Fourth Proportional to 728.48, 1,006.08 and 711.74

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Solution

The fourth proportional to 728.48, 1,006.08 and 711.74 is: 982.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.48 : 1,006.08 = 711.74 : x
  2. Step 2: Convert to fraction form
    728.48/1,006.08 = 711.74/x
  3. Step 3: Cross multiply
    728.48x = 1,006.08 × 711.74
  4. Step 4: Simplify right side
    728.48x = 716,067.38
  5. Step 5: Solve for x
    x = 716,067.38/728.48
  6. Step 6: Final answer
    x = 982.96

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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.