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Finding the Fourth Proportional to 1,043.55, 1,565.33 and 986.85

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Solution

The fourth proportional to 1,043.55, 1,565.33 and 986.85 is: 1,480.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,043.55 : 1,565.33 = 986.85 : x
  2. Step 2: Convert to fraction form
    1,043.55/1,565.33 = 986.85/x
  3. Step 3: Cross multiply
    1,043.55x = 1,565.33 × 986.85
  4. Step 4: Simplify right side
    1,043.55x = 1,544,740.98
  5. Step 5: Solve for x
    x = 1,544,740.98/1,043.55
  6. Step 6: Final answer
    x = 1,480.28

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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.