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Finding the Fourth Proportional to 876.63, 1,314.95 and 492.15

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Solution

The fourth proportional to 876.63, 1,314.95 and 492.15 is: 738.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.63 : 1,314.95 = 492.15 : x
  2. Step 2: Convert to fraction form
    876.63/1,314.95 = 492.15/x
  3. Step 3: Cross multiply
    876.63x = 1,314.95 × 492.15
  4. Step 4: Simplify right side
    876.63x = 647,150.18
  5. Step 5: Solve for x
    x = 647,150.18/876.63
  6. Step 6: Final answer
    x = 738.23

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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.