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Finding the Fourth Proportional to 989.60, 1,364.52 and 865.04

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Solution

The fourth proportional to 989.60, 1,364.52 and 865.04 is: 1,192.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.60 : 1,364.52 = 865.04 : x
  2. Step 2: Convert to fraction form
    989.60/1,364.52 = 865.04/x
  3. Step 3: Cross multiply
    989.60x = 1,364.52 × 865.04
  4. Step 4: Simplify right side
    989.60x = 1,180,364.38
  5. Step 5: Solve for x
    x = 1,180,364.38/989.60
  6. Step 6: Final answer
    x = 1,192.77

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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.