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Finding the Fourth Proportional to 689.22, 950.67 and 665.46

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Solution

The fourth proportional to 689.22, 950.67 and 665.46 is: 917.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.22 : 950.67 = 665.46 : x
  2. Step 2: Convert to fraction form
    689.22/950.67 = 665.46/x
  3. Step 3: Cross multiply
    689.22x = 950.67 × 665.46
  4. Step 4: Simplify right side
    689.22x = 632,632.86
  5. Step 5: Solve for x
    x = 632,632.86/689.22
  6. Step 6: Final answer
    x = 917.90

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1.5x scale

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.