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Finding the Fourth Proportional to 14.40, 19.80 and 13.55

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Solution

The fourth proportional to 14.40, 19.80 and 13.55 is: 18.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    14.40 : 19.80 = 13.55 : x
  2. Step 2: Convert to fraction form
    14.40/19.80 = 13.55/x
  3. Step 3: Cross multiply
    14.40x = 19.80 × 13.55
  4. Step 4: Simplify right side
    14.40x = 268.19
  5. Step 5: Solve for x
    x = 268.19/14.40
  6. Step 6: Final answer
    x = 18.62

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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.