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Finding the Fourth Proportional to 787.11, 1,179.55 and 613.01

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Solution

The fourth proportional to 787.11, 1,179.55 and 613.01 is: 918.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.11 : 1,179.55 = 613.01 : x
  2. Step 2: Convert to fraction form
    787.11/1,179.55 = 613.01/x
  3. Step 3: Cross multiply
    787.11x = 1,179.55 × 613.01
  4. Step 4: Simplify right side
    787.11x = 723,074.41
  5. Step 5: Solve for x
    x = 723,074.41/787.11
  6. Step 6: Final answer
    x = 918.65

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.