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Finding the Fourth Proportional to 951.70, 1,312.86 and 620.68

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Solution

The fourth proportional to 951.70, 1,312.86 and 620.68 is: 856.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    951.70 : 1,312.86 = 620.68 : x
  2. Step 2: Convert to fraction form
    951.70/1,312.86 = 620.68/x
  3. Step 3: Cross multiply
    951.70x = 1,312.86 × 620.68
  4. Step 4: Simplify right side
    951.70x = 814,865.94
  5. Step 5: Solve for x
    x = 814,865.94/951.70
  6. Step 6: Final answer
    x = 856.22

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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.