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Finding the Fourth Proportional to 787.48, 1,086.74 and 438.19

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Solution

The fourth proportional to 787.48, 1,086.74 and 438.19 is: 604.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.48 : 1,086.74 = 438.19 : x
  2. Step 2: Convert to fraction form
    787.48/1,086.74 = 438.19/x
  3. Step 3: Cross multiply
    787.48x = 1,086.74 × 438.19
  4. Step 4: Simplify right side
    787.48x = 476,198.60
  5. Step 5: Solve for x
    x = 476,198.60/787.48
  6. Step 6: Final answer
    x = 604.71

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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.