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Finding the Fourth Proportional to 787, 1,180.50 and 239.17

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Solution

The fourth proportional to 787, 1,180.50 and 239.17 is: 358.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    787 : 1,180.50 = 239.17 : x
  2. Step 2: Convert to fraction form
    787/1,180.50 = 239.17/x
  3. Step 3: Cross multiply
    787x = 1,180.50 × 239.17
  4. Step 4: Simplify right side
    787x = 282,340.19
  5. Step 5: Solve for x
    x = 282,340.19/787
  6. Step 6: Final answer
    x = 358.76

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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.