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Finding the Fourth Proportional to 15.63, 21.51 and 14.69

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Solution

The fourth proportional to 15.63, 21.51 and 14.69 is: 20.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    15.63 : 21.51 = 14.69 : x
  2. Step 2: Convert to fraction form
    15.63/21.51 = 14.69/x
  3. Step 3: Cross multiply
    15.63x = 21.51 × 14.69
  4. Step 4: Simplify right side
    15.63x = 315.87
  5. Step 5: Solve for x
    x = 315.87/15.63
  6. Step 6: Final answer
    x = 20.21

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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.