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Finding the Fourth Proportional to 901, 1,243.38 and 487

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Solution

The fourth proportional to 901, 1,243.38 and 487 is: 672.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    901 : 1,243.38 = 487 : x
  2. Step 2: Convert to fraction form
    901/1,243.38 = 487/x
  3. Step 3: Cross multiply
    901x = 1,243.38 × 487
  4. Step 4: Simplify right side
    901x = 605,526.06
  5. Step 5: Solve for x
    x = 605,526.06/901
  6. Step 6: Final answer
    x = 672.06

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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.