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Finding the Fourth Proportional to 653.48, 979.99 and 191.15

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Solution

The fourth proportional to 653.48, 979.99 and 191.15 is: 286.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    653.48 : 979.99 = 191.15 : x
  2. Step 2: Convert to fraction form
    653.48/979.99 = 191.15/x
  3. Step 3: Cross multiply
    653.48x = 979.99 × 191.15
  4. Step 4: Simplify right side
    653.48x = 187,319.71
  5. Step 5: Solve for x
    x = 187,319.71/653.48
  6. Step 6: Final answer
    x = 286.65

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.