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Finding the Fourth Proportional to 1,043.79, 1,565.73 and 860.85

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Solution

The fourth proportional to 1,043.79, 1,565.73 and 860.85 is: 1,291.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,043.79 : 1,565.73 = 860.85 : x
  2. Step 2: Convert to fraction form
    1,043.79/1,565.73 = 860.85/x
  3. Step 3: Cross multiply
    1,043.79x = 1,565.73 × 860.85
  4. Step 4: Simplify right side
    1,043.79x = 1,347,846.54
  5. Step 5: Solve for x
    x = 1,347,846.54/1,043.79
  6. Step 6: Final answer
    x = 1,291.31

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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.