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Finding the Fourth Proportional to 631.24, 870.79 and 369.11

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Solution

The fourth proportional to 631.24, 870.79 and 369.11 is: 509.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.24 : 870.79 = 369.11 : x
  2. Step 2: Convert to fraction form
    631.24/870.79 = 369.11/x
  3. Step 3: Cross multiply
    631.24x = 870.79 × 369.11
  4. Step 4: Simplify right side
    631.24x = 321,414.34
  5. Step 5: Solve for x
    x = 321,414.34/631.24
  6. Step 6: Final answer
    x = 509.18

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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.