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Finding the Fourth Proportional to 787.12, 1,086.42 and 492.76

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Solution

The fourth proportional to 787.12, 1,086.42 and 492.76 is: 680.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.12 : 1,086.42 = 492.76 : x
  2. Step 2: Convert to fraction form
    787.12/1,086.42 = 492.76/x
  3. Step 3: Cross multiply
    787.12x = 1,086.42 × 492.76
  4. Step 4: Simplify right side
    787.12x = 535,344.32
  5. Step 5: Solve for x
    x = 535,344.32/787.12
  6. Step 6: Final answer
    x = 680.13

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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.