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Finding the Fourth Proportional to 1,909.73, 2,866.40 and 985.92

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Solution

The fourth proportional to 1,909.73, 2,866.40 and 985.92 is: 1,479.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,909.73 : 2,866.40 = 985.92 : x
  2. Step 2: Convert to fraction form
    1,909.73/2,866.40 = 985.92/x
  3. Step 3: Cross multiply
    1,909.73x = 2,866.40 × 985.92
  4. Step 4: Simplify right side
    1,909.73x = 2,826,036.16
  5. Step 5: Solve for x
    x = 2,826,036.16/1,909.73
  6. Step 6: Final answer
    x = 1,479.81

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.