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Finding the Fourth Proportional to 630.91, 870.71 and 351.20

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Solution

The fourth proportional to 630.91, 870.71 and 351.20 is: 484.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    630.91 : 870.71 = 351.20 : x
  2. Step 2: Convert to fraction form
    630.91/870.71 = 351.20/x
  3. Step 3: Cross multiply
    630.91x = 870.71 × 351.20
  4. Step 4: Simplify right side
    630.91x = 305,793.77
  5. Step 5: Solve for x
    x = 305,793.77/630.91
  6. Step 6: Final answer
    x = 484.69

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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.