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Finding the Fourth Proportional to 689.39, 951.40 and 394.67

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Solution

The fourth proportional to 689.39, 951.40 and 394.67 is: 544.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.39 : 951.40 = 394.67 : x
  2. Step 2: Convert to fraction form
    689.39/951.40 = 394.67/x
  3. Step 3: Cross multiply
    689.39x = 951.40 × 394.67
  4. Step 4: Simplify right side
    689.39x = 375,484.28
  5. Step 5: Solve for x
    x = 375,484.28/689.39
  6. Step 6: Final answer
    x = 544.67

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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.