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Finding the Fourth Proportional to 1,048.71, 1,447.88 and 717.58

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Solution

The fourth proportional to 1,048.71, 1,447.88 and 717.58 is: 990.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,048.71 : 1,447.88 = 717.58 : x
  2. Step 2: Convert to fraction form
    1,048.71/1,447.88 = 717.58/x
  3. Step 3: Cross multiply
    1,048.71x = 1,447.88 × 717.58
  4. Step 4: Simplify right side
    1,048.71x = 1,038,969.73
  5. Step 5: Solve for x
    x = 1,038,969.73/1,048.71
  6. Step 6: Final answer
    x = 990.71

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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.