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Finding the Fourth Proportional to 631.67, 947.51 and 285.17

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Solution

The fourth proportional to 631.67, 947.51 and 285.17 is: 427.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.67 : 947.51 = 285.17 : x
  2. Step 2: Convert to fraction form
    631.67/947.51 = 285.17/x
  3. Step 3: Cross multiply
    631.67x = 947.51 × 285.17
  4. Step 4: Simplify right side
    631.67x = 270,204.51
  5. Step 5: Solve for x
    x = 270,204.51/631.67
  6. Step 6: Final answer
    x = 427.76

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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.