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Finding the Fourth Proportional to 901.72, 1,243.81 and 621.47

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Solution

The fourth proportional to 901.72, 1,243.81 and 621.47 is: 857.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    901.72 : 1,243.81 = 621.47 : x
  2. Step 2: Convert to fraction form
    901.72/1,243.81 = 621.47/x
  3. Step 3: Cross multiply
    901.72x = 1,243.81 × 621.47
  4. Step 4: Simplify right side
    901.72x = 772,990.99
  5. Step 5: Solve for x
    x = 772,990.99/901.72
  6. Step 6: Final answer
    x = 857.24

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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.