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Finding the Fourth Proportional to 876.30, 1,314.90 and 328.64

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Solution

The fourth proportional to 876.30, 1,314.90 and 328.64 is: 493.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.30 : 1,314.90 = 328.64 : x
  2. Step 2: Convert to fraction form
    876.30/1,314.90 = 328.64/x
  3. Step 3: Cross multiply
    876.30x = 1,314.90 × 328.64
  4. Step 4: Simplify right side
    876.30x = 432,122.16
  5. Step 5: Solve for x
    x = 432,122.16/876.30
  6. Step 6: Final answer
    x = 493.12

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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.