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Finding the Fourth Proportional to 653.28, 901.40 and 391.38

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Solution

The fourth proportional to 653.28, 901.40 and 391.38 is: 540.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    653.28 : 901.40 = 391.38 : x
  2. Step 2: Convert to fraction form
    653.28/901.40 = 391.38/x
  3. Step 3: Cross multiply
    653.28x = 901.40 × 391.38
  4. Step 4: Simplify right side
    653.28x = 352,789.93
  5. Step 5: Solve for x
    x = 352,789.93/653.28
  6. Step 6: Final answer
    x = 540.03

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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.