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Finding the Fourth Proportional to 210.57, 315.86 and 114.99

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Solution

The fourth proportional to 210.57, 315.86 and 114.99 is: 172.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.57 : 315.86 = 114.99 : x
  2. Step 2: Convert to fraction form
    210.57/315.86 = 114.99/x
  3. Step 3: Cross multiply
    210.57x = 315.86 × 114.99
  4. Step 4: Simplify right side
    210.57x = 36,321.19
  5. Step 5: Solve for x
    x = 36,321.19/210.57
  6. Step 6: Final answer
    x = 172.49

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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.