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Finding the Fourth Proportional to 787.73, 1,087.08 and 456.19

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Solution

The fourth proportional to 787.73, 1,087.08 and 456.19 is: 629.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.73 : 1,087.08 = 456.19 : x
  2. Step 2: Convert to fraction form
    787.73/1,087.08 = 456.19/x
  3. Step 3: Cross multiply
    787.73x = 1,087.08 × 456.19
  4. Step 4: Simplify right side
    787.73x = 495,915.03
  5. Step 5: Solve for x
    x = 495,915.03/787.73
  6. Step 6: Final answer
    x = 629.55

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Double scale
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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.