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Finding the Fourth Proportional to 876.78, 1,314.79 and 328.58

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Solution

The fourth proportional to 876.78, 1,314.79 and 328.58 is: 492.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.78 : 1,314.79 = 328.58 : x
  2. Step 2: Convert to fraction form
    876.78/1,314.79 = 328.58/x
  3. Step 3: Cross multiply
    876.78x = 1,314.79 × 328.58
  4. Step 4: Simplify right side
    876.78x = 432,005.48
  5. Step 5: Solve for x
    x = 432,005.48/876.78
  6. Step 6: Final answer
    x = 492.72

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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.