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Finding the Fourth Proportional to 901.28, 1,243.77 and 487.28

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Solution

The fourth proportional to 901.28, 1,243.77 and 487.28 is: 672.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    901.28 : 1,243.77 = 487.28 : x
  2. Step 2: Convert to fraction form
    901.28/1,243.77 = 487.28/x
  3. Step 3: Cross multiply
    901.28x = 1,243.77 × 487.28
  4. Step 4: Simplify right side
    901.28x = 606,064.25
  5. Step 5: Solve for x
    x = 606,064.25/901.28
  6. Step 6: Final answer
    x = 672.45

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.