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Finding the Fourth Proportional to 631.34, 947.08 and 220.51

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Solution

The fourth proportional to 631.34, 947.08 and 220.51 is: 330.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.34 : 947.08 = 220.51 : x
  2. Step 2: Convert to fraction form
    631.34/947.08 = 220.51/x
  3. Step 3: Cross multiply
    631.34x = 947.08 × 220.51
  4. Step 4: Simplify right side
    631.34x = 208,840.61
  5. Step 5: Solve for x
    x = 208,840.61/631.34
  6. Step 6: Final answer
    x = 330.79

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Double scale
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Similar ratio
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1.5x scale

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.