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Finding the Fourth Proportional to 23.55, 32.40 and 19.86

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Solution

The fourth proportional to 23.55, 32.40 and 19.86 is: 27.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    23.55 : 32.40 = 19.86 : x
  2. Step 2: Convert to fraction form
    23.55/32.40 = 19.86/x
  3. Step 3: Cross multiply
    23.55x = 32.40 × 19.86
  4. Step 4: Simplify right side
    23.55x = 643.46
  5. Step 5: Solve for x
    x = 643.46/23.55
  6. Step 6: Final answer
    x = 27.32

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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.