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Finding the Fourth Proportional to 64.86, 89.94 and 62.88

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Solution

The fourth proportional to 64.86, 89.94 and 62.88 is: 87.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.86 : 89.94 = 62.88 : x
  2. Step 2: Convert to fraction form
    64.86/89.94 = 62.88/x
  3. Step 3: Cross multiply
    64.86x = 89.94 × 62.88
  4. Step 4: Simplify right side
    64.86x = 5,655.43
  5. Step 5: Solve for x
    x = 5,655.43/64.86
  6. Step 6: Final answer
    x = 87.19

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.