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Finding the Fourth Proportional to 23.47, 32.40 and 15.31

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Solution

The fourth proportional to 23.47, 32.40 and 15.31 is: 21.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    23.47 : 32.40 = 15.31 : x
  2. Step 2: Convert to fraction form
    23.47/32.40 = 15.31/x
  3. Step 3: Cross multiply
    23.47x = 32.40 × 15.31
  4. Step 4: Simplify right side
    23.47x = 496.04
  5. Step 5: Solve for x
    x = 496.04/23.47
  6. Step 6: Final answer
    x = 21.14

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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.