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Finding the Fourth Proportional to 210.53, 315.16 and 129.13

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Solution

The fourth proportional to 210.53, 315.16 and 129.13 is: 193.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.53 : 315.16 = 129.13 : x
  2. Step 2: Convert to fraction form
    210.53/315.16 = 129.13/x
  3. Step 3: Cross multiply
    210.53x = 315.16 × 129.13
  4. Step 4: Simplify right side
    210.53x = 40,695.50
  5. Step 5: Solve for x
    x = 40,695.50/210.53
  6. Step 6: Final answer
    x = 193.30

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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.