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Finding the Fourth Proportional to 88.60, 122.80 and 86.98

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Solution

The fourth proportional to 88.60, 122.80 and 86.98 is: 120.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.60 : 122.80 = 86.98 : x
  2. Step 2: Convert to fraction form
    88.60/122.80 = 86.98/x
  3. Step 3: Cross multiply
    88.60x = 122.80 × 86.98
  4. Step 4: Simplify right side
    88.60x = 10,681.14
  5. Step 5: Solve for x
    x = 10,681.14/88.60
  6. Step 6: Final answer
    x = 120.55

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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.