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Finding the Fourth Proportional to 279.99, 386.08 and 191.45

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Solution

The fourth proportional to 279.99, 386.08 and 191.45 is: 263.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.99 : 386.08 = 191.45 : x
  2. Step 2: Convert to fraction form
    279.99/386.08 = 191.45/x
  3. Step 3: Cross multiply
    279.99x = 386.08 × 191.45
  4. Step 4: Simplify right side
    279.99x = 73,915.02
  5. Step 5: Solve for x
    x = 73,915.02/279.99
  6. Step 6: Final answer
    x = 263.99

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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.