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Finding the Fourth Proportional to 210.29, 315.43 and 86.95

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Solution

The fourth proportional to 210.29, 315.43 and 86.95 is: 130.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.29 : 315.43 = 86.95 : x
  2. Step 2: Convert to fraction form
    210.29/315.43 = 86.95/x
  3. Step 3: Cross multiply
    210.29x = 315.43 × 86.95
  4. Step 4: Simplify right side
    210.29x = 27,426.64
  5. Step 5: Solve for x
    x = 27,426.64/210.29
  6. Step 6: Final answer
    x = 130.42

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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.