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Finding the Fourth Proportional to 210.14, 314.93 and 128.80

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Solution

The fourth proportional to 210.14, 314.93 and 128.80 is: 193.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.14 : 314.93 = 128.80 : x
  2. Step 2: Convert to fraction form
    210.14/314.93 = 128.80/x
  3. Step 3: Cross multiply
    210.14x = 314.93 × 128.80
  4. Step 4: Simplify right side
    210.14x = 40,562.52
  5. Step 5: Solve for x
    x = 40,562.52/210.14
  6. Step 6: Final answer
    x = 193.03

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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.