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Finding the Fourth Proportional to 985.92, 1,366.32 and 972

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Solution

The fourth proportional to 985.92, 1,366.32 and 972 is: 1,347.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.92 : 1,366.32 = 972 : x
  2. Step 2: Convert to fraction form
    985.92/1,366.32 = 972/x
  3. Step 3: Cross multiply
    985.92x = 1,366.32 × 972
  4. Step 4: Simplify right side
    985.92x = 1,328,063.04
  5. Step 5: Solve for x
    x = 1,328,063.04/985.92
  6. Step 6: Final answer
    x = 1,347.03

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.