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Finding the Fourth Proportional to 210.24, 314.90 and 128.83

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Solution

The fourth proportional to 210.24, 314.90 and 128.83 is: 192.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.24 : 314.90 = 128.83 : x
  2. Step 2: Convert to fraction form
    210.24/314.90 = 128.83/x
  3. Step 3: Cross multiply
    210.24x = 314.90 × 128.83
  4. Step 4: Simplify right side
    210.24x = 40,568.57
  5. Step 5: Solve for x
    x = 40,568.57/210.24
  6. Step 6: Final answer
    x = 192.96

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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.