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Finding the Fourth Proportional to 245.50, 368.19 and 99.21

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Solution

The fourth proportional to 245.50, 368.19 and 99.21 is: 148.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    245.50 : 368.19 = 99.21 : x
  2. Step 2: Convert to fraction form
    245.50/368.19 = 99.21/x
  3. Step 3: Cross multiply
    245.50x = 368.19 × 99.21
  4. Step 4: Simplify right side
    245.50x = 36,528.13
  5. Step 5: Solve for x
    x = 36,528.13/245.50
  6. Step 6: Final answer
    x = 148.79

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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.