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Finding the Fourth Proportional to 989.32, 1,366.41 and 657.17

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Solution

The fourth proportional to 989.32, 1,366.41 and 657.17 is: 907.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.32 : 1,366.41 = 657.17 : x
  2. Step 2: Convert to fraction form
    989.32/1,366.41 = 657.17/x
  3. Step 3: Cross multiply
    989.32x = 1,366.41 × 657.17
  4. Step 4: Simplify right side
    989.32x = 897,963.66
  5. Step 5: Solve for x
    x = 897,963.66/989.32
  6. Step 6: Final answer
    x = 907.66

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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.