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Finding the Fourth Proportional to 631.13, 870.98 and 351.36

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Solution

The fourth proportional to 631.13, 870.98 and 351.36 is: 484.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.13 : 870.98 = 351.36 : x
  2. Step 2: Convert to fraction form
    631.13/870.98 = 351.36/x
  3. Step 3: Cross multiply
    631.13x = 870.98 × 351.36
  4. Step 4: Simplify right side
    631.13x = 306,025.78
  5. Step 5: Solve for x
    x = 306,025.78/631.13
  6. Step 6: Final answer
    x = 484.89

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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.