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Finding the Fourth Proportional to 210.21, 315.31 and 88.48

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Solution

The fourth proportional to 210.21, 315.31 and 88.48 is: 132.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.21 : 315.31 = 88.48 : x
  2. Step 2: Convert to fraction form
    210.21/315.31 = 88.48/x
  3. Step 3: Cross multiply
    210.21x = 315.31 × 88.48
  4. Step 4: Simplify right side
    210.21x = 27,898.63
  5. Step 5: Solve for x
    x = 27,898.63/210.21
  6. Step 6: Final answer
    x = 132.72

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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.