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Finding the Fourth Proportional to 210.57, 315.84 and 66.29

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Solution

The fourth proportional to 210.57, 315.84 and 66.29 is: 99.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.57 : 315.84 = 66.29 : x
  2. Step 2: Convert to fraction form
    210.57/315.84 = 66.29/x
  3. Step 3: Cross multiply
    210.57x = 315.84 × 66.29
  4. Step 4: Simplify right side
    210.57x = 20,935.45
  5. Step 5: Solve for x
    x = 20,935.45/210.57
  6. Step 6: Final answer
    x = 99.42

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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.