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Finding the Fourth Proportional to 631.88, 947.60 and 215.35

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Solution

The fourth proportional to 631.88, 947.60 and 215.35 is: 322.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.88 : 947.60 = 215.35 : x
  2. Step 2: Convert to fraction form
    631.88/947.60 = 215.35/x
  3. Step 3: Cross multiply
    631.88x = 947.60 × 215.35
  4. Step 4: Simplify right side
    631.88x = 204,065.66
  5. Step 5: Solve for x
    x = 204,065.66/631.88
  6. Step 6: Final answer
    x = 322.95

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.