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Finding the Fourth Proportional to 103.99, 155.88 and 60.70

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Solution

The fourth proportional to 103.99, 155.88 and 60.70 is: 90.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.99 : 155.88 = 60.70 : x
  2. Step 2: Convert to fraction form
    103.99/155.88 = 60.70/x
  3. Step 3: Cross multiply
    103.99x = 155.88 × 60.70
  4. Step 4: Simplify right side
    103.99x = 9,461.92
  5. Step 5: Solve for x
    x = 9,461.92/103.99
  6. Step 6: Final answer
    x = 90.99

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.