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Finding the Fourth Proportional to 989.97, 1,366.17 and 570.33

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Solution

The fourth proportional to 989.97, 1,366.17 and 570.33 is: 787.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.97 : 1,366.17 = 570.33 : x
  2. Step 2: Convert to fraction form
    989.97/1,366.17 = 570.33/x
  3. Step 3: Cross multiply
    989.97x = 1,366.17 × 570.33
  4. Step 4: Simplify right side
    989.97x = 779,167.74
  5. Step 5: Solve for x
    x = 779,167.74/989.97
  6. Step 6: Final answer
    x = 787.06

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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.