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Finding the Fourth Proportional to 989.52, 1,365.35 and 635.51

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Solution

The fourth proportional to 989.52, 1,365.35 and 635.51 is: 876.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.52 : 1,365.35 = 635.51 : x
  2. Step 2: Convert to fraction form
    989.52/1,365.35 = 635.51/x
  3. Step 3: Cross multiply
    989.52x = 1,365.35 × 635.51
  4. Step 4: Simplify right side
    989.52x = 867,683.57
  5. Step 5: Solve for x
    x = 867,683.57/989.52
  6. Step 6: Final answer
    x = 876.87

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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.