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Finding the Fourth Proportional to 869.77, 1,311.01 and 819.55

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Solution

The fourth proportional to 869.77, 1,311.01 and 819.55 is: 1,235.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.77 : 1,311.01 = 819.55 : x
  2. Step 2: Convert to fraction form
    869.77/1,311.01 = 819.55/x
  3. Step 3: Cross multiply
    869.77x = 1,311.01 × 819.55
  4. Step 4: Simplify right side
    869.77x = 1,074,438.25
  5. Step 5: Solve for x
    x = 1,074,438.25/869.77
  6. Step 6: Final answer
    x = 1,235.31

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.