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Finding the Fourth Proportional to 947.56, 1,422.09 and 400.12

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Solution

The fourth proportional to 947.56, 1,422.09 and 400.12 is: 600.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.56 : 1,422.09 = 400.12 : x
  2. Step 2: Convert to fraction form
    947.56/1,422.09 = 400.12/x
  3. Step 3: Cross multiply
    947.56x = 1,422.09 × 400.12
  4. Step 4: Simplify right side
    947.56x = 569,006.65
  5. Step 5: Solve for x
    x = 569,006.65/947.56
  6. Step 6: Final answer
    x = 600.50

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Half scale
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Double scale
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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.