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Finding the Fourth Proportional to 62.37, 86.19 and 56.91

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Solution

The fourth proportional to 62.37, 86.19 and 56.91 is: 78.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    62.37 : 86.19 = 56.91 : x
  2. Step 2: Convert to fraction form
    62.37/86.19 = 56.91/x
  3. Step 3: Cross multiply
    62.37x = 86.19 × 56.91
  4. Step 4: Simplify right side
    62.37x = 4,905.07
  5. Step 5: Solve for x
    x = 4,905.07/62.37
  6. Step 6: Final answer
    x = 78.64

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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.