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Finding the Fourth Proportional to 950.79, 1,312.22 and 620.70

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Solution

The fourth proportional to 950.79, 1,312.22 and 620.70 is: 856.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    950.79 : 1,312.22 = 620.70 : x
  2. Step 2: Convert to fraction form
    950.79/1,312.22 = 620.70/x
  3. Step 3: Cross multiply
    950.79x = 1,312.22 × 620.70
  4. Step 4: Simplify right side
    950.79x = 814,491.85
  5. Step 5: Solve for x
    x = 814,491.85/950.79
  6. Step 6: Final answer
    x = 856.65

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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.