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Finding the Fourth Proportional to 631.11, 870.91 and 351.35

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Solution

The fourth proportional to 631.11, 870.91 and 351.35 is: 484.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.11 : 870.91 = 351.35 : x
  2. Step 2: Convert to fraction form
    631.11/870.91 = 351.35/x
  3. Step 3: Cross multiply
    631.11x = 870.91 × 351.35
  4. Step 4: Simplify right side
    631.11x = 305,994.23
  5. Step 5: Solve for x
    x = 305,994.23/631.11
  6. Step 6: Final answer
    x = 484.85

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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.