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Finding the Fourth Proportional to 56.40, 84.60 and 15.81

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Solution

The fourth proportional to 56.40, 84.60 and 15.81 is: 23.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.40 : 84.60 = 15.81 : x
  2. Step 2: Convert to fraction form
    56.40/84.60 = 15.81/x
  3. Step 3: Cross multiply
    56.40x = 84.60 × 15.81
  4. Step 4: Simplify right side
    56.40x = 1,337.53
  5. Step 5: Solve for x
    x = 1,337.53/56.40
  6. Step 6: Final answer
    x = 23.72

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.