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Finding the Fourth Proportional to 630.86, 870.72 and 351.19

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Solution

The fourth proportional to 630.86, 870.72 and 351.19 is: 484.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    630.86 : 870.72 = 351.19 : x
  2. Step 2: Convert to fraction form
    630.86/870.72 = 351.19/x
  3. Step 3: Cross multiply
    630.86x = 870.72 × 351.19
  4. Step 4: Simplify right side
    630.86x = 305,785.98
  5. Step 5: Solve for x
    x = 305,785.98/630.86
  6. Step 6: Final answer
    x = 484.72

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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.