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Finding the Fourth Proportional to 876.18, 1,314.35 and 291.20

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Solution

The fourth proportional to 876.18, 1,314.35 and 291.20 is: 436.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.18 : 1,314.35 = 291.20 : x
  2. Step 2: Convert to fraction form
    876.18/1,314.35 = 291.20/x
  3. Step 3: Cross multiply
    876.18x = 1,314.35 × 291.20
  4. Step 4: Simplify right side
    876.18x = 382,730.69
  5. Step 5: Solve for x
    x = 382,730.69/876.18
  6. Step 6: Final answer
    x = 436.82

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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.