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Finding the Fourth Proportional to 951.87, 1,312.75 and 620.18

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Solution

The fourth proportional to 951.87, 1,312.75 and 620.18 is: 855.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    951.87 : 1,312.75 = 620.18 : x
  2. Step 2: Convert to fraction form
    951.87/1,312.75 = 620.18/x
  3. Step 3: Cross multiply
    951.87x = 1,312.75 × 620.18
  4. Step 4: Simplify right side
    951.87x = 814,141.30
  5. Step 5: Solve for x
    x = 814,141.30/951.87
  6. Step 6: Final answer
    x = 855.31

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.