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Finding the Fourth Proportional to 787.08, 1,180.79 and 239.30

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Solution

The fourth proportional to 787.08, 1,180.79 and 239.30 is: 358.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.08 : 1,180.79 = 239.30 : x
  2. Step 2: Convert to fraction form
    787.08/1,180.79 = 239.30/x
  3. Step 3: Cross multiply
    787.08x = 1,180.79 × 239.30
  4. Step 4: Simplify right side
    787.08x = 282,555.95
  5. Step 5: Solve for x
    x = 282,555.95/787.08
  6. Step 6: Final answer
    x = 358.99

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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.