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Finding the Fourth Proportional to 14.95, 20.64 and 8.40

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Solution

The fourth proportional to 14.95, 20.64 and 8.40 is: 11.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    14.95 : 20.64 = 8.40 : x
  2. Step 2: Convert to fraction form
    14.95/20.64 = 8.40/x
  3. Step 3: Cross multiply
    14.95x = 20.64 × 8.40
  4. Step 4: Simplify right side
    14.95x = 173.26
  5. Step 5: Solve for x
    x = 173.26/14.95
  6. Step 6: Final answer
    x = 11.59

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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.