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Finding the Fourth Proportional to 210.40, 315.76 and 94.88

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Solution

The fourth proportional to 210.40, 315.76 and 94.88 is: 142.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.40 : 315.76 = 94.88 : x
  2. Step 2: Convert to fraction form
    210.40/315.76 = 94.88/x
  3. Step 3: Cross multiply
    210.40x = 315.76 × 94.88
  4. Step 4: Simplify right side
    210.40x = 29,959.31
  5. Step 5: Solve for x
    x = 29,959.31/210.40
  6. Step 6: Final answer
    x = 142.39

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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.