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Finding the Fourth Proportional to 139.99, 210.05 and 74.98

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Solution

The fourth proportional to 139.99, 210.05 and 74.98 is: 112.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.99 : 210.05 = 74.98 : x
  2. Step 2: Convert to fraction form
    139.99/210.05 = 74.98/x
  3. Step 3: Cross multiply
    139.99x = 210.05 × 74.98
  4. Step 4: Simplify right side
    139.99x = 15,748.31
  5. Step 5: Solve for x
    x = 15,748.31/139.99
  6. Step 6: Final answer
    x = 112.49

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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.