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Finding the Fourth Proportional to 8,781.72, 12,123.18 and 6,787.77

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Solution

The fourth proportional to 8,781.72, 12,123.18 and 6,787.77 is: 9,370.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,781.72 : 12,123.18 = 6,787.77 : x
  2. Step 2: Convert to fraction form
    8,781.72/12,123.18 = 6,787.77/x
  3. Step 3: Cross multiply
    8,781.72x = 12,123.18 × 6,787.77
  4. Step 4: Simplify right side
    8,781.72x = 82,289,357.51
  5. Step 5: Solve for x
    x = 82,289,357.51/8,781.72
  6. Step 6: Final answer
    x = 9,370.53

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1.5x scale

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.