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Finding the Fourth Proportional to 1,013.85, 1,399.35 and 847.78

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Solution

The fourth proportional to 1,013.85, 1,399.35 and 847.78 is: 1,170.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,013.85 : 1,399.35 = 847.78 : x
  2. Step 2: Convert to fraction form
    1,013.85/1,399.35 = 847.78/x
  3. Step 3: Cross multiply
    1,013.85x = 1,399.35 × 847.78
  4. Step 4: Simplify right side
    1,013.85x = 1,186,340.94
  5. Step 5: Solve for x
    x = 1,186,340.94/1,013.85
  6. Step 6: Final answer
    x = 1,170.13

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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.