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Finding the Fourth Proportional to 787, 1,180.46 and 239.18

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Solution

The fourth proportional to 787, 1,180.46 and 239.18 is: 358.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    787 : 1,180.46 = 239.18 : x
  2. Step 2: Convert to fraction form
    787/1,180.46 = 239.18/x
  3. Step 3: Cross multiply
    787x = 1,180.46 × 239.18
  4. Step 4: Simplify right side
    787x = 282,342.42
  5. Step 5: Solve for x
    x = 282,342.42/787
  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.