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Finding the Fourth Proportional to 901.16, 1,243.60 and 487.16

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Solution

The fourth proportional to 901.16, 1,243.60 and 487.16 is: 672.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    901.16 : 1,243.60 = 487.16 : x
  2. Step 2: Convert to fraction form
    901.16/1,243.60 = 487.16/x
  3. Step 3: Cross multiply
    901.16x = 1,243.60 × 487.16
  4. Step 4: Simplify right side
    901.16x = 605,829.74
  5. Step 5: Solve for x
    x = 605,829.74/901.16
  6. Step 6: Final answer
    x = 672.28

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.