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Finding the Fourth Proportional to 1,559.97, 2,152.95 and 985.11

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Solution

The fourth proportional to 1,559.97, 2,152.95 and 985.11 is: 1,359.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,559.97 : 2,152.95 = 985.11 : x
  2. Step 2: Convert to fraction form
    1,559.97/2,152.95 = 985.11/x
  3. Step 3: Cross multiply
    1,559.97x = 2,152.95 × 985.11
  4. Step 4: Simplify right side
    1,559.97x = 2,120,892.57
  5. Step 5: Solve for x
    x = 2,120,892.57/1,559.97
  6. Step 6: Final answer
    x = 1,359.57

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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.