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Finding the Fourth Proportional to 631.88, 947.80 and 193.14

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Solution

The fourth proportional to 631.88, 947.80 and 193.14 is: 289.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.88 : 947.80 = 193.14 : x
  2. Step 2: Convert to fraction form
    631.88/947.80 = 193.14/x
  3. Step 3: Cross multiply
    631.88x = 947.80 × 193.14
  4. Step 4: Simplify right side
    631.88x = 183,058.09
  5. Step 5: Solve for x
    x = 183,058.09/631.88
  6. Step 6: Final answer
    x = 289.70

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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.