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Finding the Fourth Proportional to 631.51, 947.35 and 220.55

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Solution

The fourth proportional to 631.51, 947.35 and 220.55 is: 330.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.51 : 947.35 = 220.55 : x
  2. Step 2: Convert to fraction form
    631.51/947.35 = 220.55/x
  3. Step 3: Cross multiply
    631.51x = 947.35 × 220.55
  4. Step 4: Simplify right side
    631.51x = 208,937.13
  5. Step 5: Solve for x
    x = 208,937.13/631.51
  6. Step 6: Final answer
    x = 330.85

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Double scale
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Similar ratio
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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.