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Finding the Fourth Proportional to 901.21, 1,243.66 and 487.21

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Solution

The fourth proportional to 901.21, 1,243.66 and 487.21 is: 672.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    901.21 : 1,243.66 = 487.21 : x
  2. Step 2: Convert to fraction form
    901.21/1,243.66 = 487.21/x
  3. Step 3: Cross multiply
    901.21x = 1,243.66 × 487.21
  4. Step 4: Simplify right side
    901.21x = 605,917.37
  5. Step 5: Solve for x
    x = 605,917.37/901.21
  6. Step 6: Final answer
    x = 672.34

Related Problems

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Half scale
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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 (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.