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Finding the Fourth Proportional to 210.64, 315.60 and 133.36

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Solution

The fourth proportional to 210.64, 315.60 and 133.36 is: 199.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.64 : 315.60 = 133.36 : x
  2. Step 2: Convert to fraction form
    210.64/315.60 = 133.36/x
  3. Step 3: Cross multiply
    210.64x = 315.60 × 133.36
  4. Step 4: Simplify right side
    210.64x = 42,088.42
  5. Step 5: Solve for x
    x = 42,088.42/210.64
  6. Step 6: Final answer
    x = 199.81

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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.