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Finding the Fourth Proportional to 901.28, 1,243.56 and 570.14

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Solution

The fourth proportional to 901.28, 1,243.56 and 570.14 is: 786.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    901.28 : 1,243.56 = 570.14 : x
  2. Step 2: Convert to fraction form
    901.28/1,243.56 = 570.14/x
  3. Step 3: Cross multiply
    901.28x = 1,243.56 × 570.14
  4. Step 4: Simplify right side
    901.28x = 709,003.30
  5. Step 5: Solve for x
    x = 709,003.30/901.28
  6. Step 6: Final answer
    x = 786.66

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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.