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Finding the Fourth Proportional to 210.40, 315.64 and 107.60

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Solution

The fourth proportional to 210.40, 315.64 and 107.60 is: 161.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.40 : 315.64 = 107.60 : x
  2. Step 2: Convert to fraction form
    210.40/315.64 = 107.60/x
  3. Step 3: Cross multiply
    210.40x = 315.64 × 107.60
  4. Step 4: Simplify right side
    210.40x = 33,962.86
  5. Step 5: Solve for x
    x = 33,962.86/210.40
  6. Step 6: Final answer
    x = 161.42

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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.