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Finding the Fourth Proportional to 1,065.78, 1,470.38 and 716.70

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Solution

The fourth proportional to 1,065.78, 1,470.38 and 716.70 is: 988.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,065.78 : 1,470.38 = 716.70 : x
  2. Step 2: Convert to fraction form
    1,065.78/1,470.38 = 716.70/x
  3. Step 3: Cross multiply
    1,065.78x = 1,470.38 × 716.70
  4. Step 4: Simplify right side
    1,065.78x = 1,053,821.35
  5. Step 5: Solve for x
    x = 1,053,821.35/1,065.78
  6. Step 6: Final answer
    x = 988.78

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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.