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Finding the Fourth Proportional to 99.76, 137.68 and 64.84

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Solution

The fourth proportional to 99.76, 137.68 and 64.84 is: 89.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.76 : 137.68 = 64.84 : x
  2. Step 2: Convert to fraction form
    99.76/137.68 = 64.84/x
  3. Step 3: Cross multiply
    99.76x = 137.68 × 64.84
  4. Step 4: Simplify right side
    99.76x = 8,927.17
  5. Step 5: Solve for x
    x = 8,927.17/99.76
  6. Step 6: Final answer
    x = 89.49

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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.