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Finding the Fourth Proportional to 210.33, 315.63 and 102.20

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Solution

The fourth proportional to 210.33, 315.63 and 102.20 is: 153.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.33 : 315.63 = 102.20 : x
  2. Step 2: Convert to fraction form
    210.33/315.63 = 102.20/x
  3. Step 3: Cross multiply
    210.33x = 315.63 × 102.20
  4. Step 4: Simplify right side
    210.33x = 32,255.81
  5. Step 5: Solve for x
    x = 32,255.81/210.33
  6. Step 6: Final answer
    x = 153.36

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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.