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Finding the Fourth Proportional to 56.21, 83.72 and 55.91

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Solution

The fourth proportional to 56.21, 83.72 and 55.91 is: 83.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.21 : 83.72 = 55.91 : x
  2. Step 2: Convert to fraction form
    56.21/83.72 = 55.91/x
  3. Step 3: Cross multiply
    56.21x = 83.72 × 55.91
  4. Step 4: Simplify right side
    56.21x = 4,680.09
  5. Step 5: Solve for x
    x = 4,680.09/56.21
  6. Step 6: Final answer
    x = 83.27

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.