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Finding the Fourth Proportional to 56, 83.84 and 42.40

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Solution

The fourth proportional to 56, 83.84 and 42.40 is: 63.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    56 : 83.84 = 42.40 : x
  2. Step 2: Convert to fraction form
    56/83.84 = 42.40/x
  3. Step 3: Cross multiply
    56x = 83.84 × 42.40
  4. Step 4: Simplify right side
    56x = 3,554.82
  5. Step 5: Solve for x
    x = 3,554.82/56
  6. Step 6: Final answer
    x = 63.48

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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.