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Finding the Fourth Proportional to 689.58, 951.66 and 394.77

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Solution

The fourth proportional to 689.58, 951.66 and 394.77 is: 544.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.58 : 951.66 = 394.77 : x
  2. Step 2: Convert to fraction form
    689.58/951.66 = 394.77/x
  3. Step 3: Cross multiply
    689.58x = 951.66 × 394.77
  4. Step 4: Simplify right side
    689.58x = 375,686.82
  5. Step 5: Solve for x
    x = 375,686.82/689.58
  6. Step 6: Final answer
    x = 544.81

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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.