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Finding the Fourth Proportional to 1,177.84, 1,766.76 and 398.72

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Solution

The fourth proportional to 1,177.84, 1,766.76 and 398.72 is: 598.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,177.84 : 1,766.76 = 398.72 : x
  2. Step 2: Convert to fraction form
    1,177.84/1,766.76 = 398.72/x
  3. Step 3: Cross multiply
    1,177.84x = 1,766.76 × 398.72
  4. Step 4: Simplify right side
    1,177.84x = 704,442.55
  5. Step 5: Solve for x
    x = 704,442.55/1,177.84
  6. Step 6: Final answer
    x = 598.08

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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.