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Finding the Fourth Proportional to 787.64, 1,086.34 and 488.72

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Solution

The fourth proportional to 787.64, 1,086.34 and 488.72 is: 674.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.64 : 1,086.34 = 488.72 : x
  2. Step 2: Convert to fraction form
    787.64/1,086.34 = 488.72/x
  3. Step 3: Cross multiply
    787.64x = 1,086.34 × 488.72
  4. Step 4: Simplify right side
    787.64x = 530,916.08
  5. Step 5: Solve for x
    x = 530,916.08/787.64
  6. Step 6: Final answer
    x = 674.06

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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.