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Finding the Fourth Proportional to 901.13, 1,243.55 and 487.13

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Solution

The fourth proportional to 901.13, 1,243.55 and 487.13 is: 672.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    901.13 : 1,243.55 = 487.13 : x
  2. Step 2: Convert to fraction form
    901.13/1,243.55 = 487.13/x
  3. Step 3: Cross multiply
    901.13x = 1,243.55 × 487.13
  4. Step 4: Simplify right side
    901.13x = 605,765.51
  5. Step 5: Solve for x
    x = 605,765.51/901.13
  6. Step 6: Final answer
    x = 672.23

Related Problems

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