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Finding the Fourth Proportional to 653.75, 901.98 and 391.71

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Solution

The fourth proportional to 653.75, 901.98 and 391.71 is: 540.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    653.75 : 901.98 = 391.71 : x
  2. Step 2: Convert to fraction form
    653.75/901.98 = 391.71/x
  3. Step 3: Cross multiply
    653.75x = 901.98 × 391.71
  4. Step 4: Simplify right side
    653.75x = 353,314.59
  5. Step 5: Solve for x
    x = 353,314.59/653.75
  6. Step 6: Final answer
    x = 540.45

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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.