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Finding the Fourth Proportional to 1,281.02, 1,766.61 and 985.77

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Solution

The fourth proportional to 1,281.02, 1,766.61 and 985.77 is: 1,359.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281.02 : 1,766.61 = 985.77 : x
  2. Step 2: Convert to fraction form
    1,281.02/1,766.61 = 985.77/x
  3. Step 3: Cross multiply
    1,281.02x = 1,766.61 × 985.77
  4. Step 4: Simplify right side
    1,281.02x = 1,741,471.14
  5. Step 5: Solve for x
    x = 1,741,471.14/1,281.02
  6. Step 6: Final answer
    x = 1,359.45

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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.