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Finding the Fourth Proportional to 210.44, 315.70 and 64.18

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Solution

The fourth proportional to 210.44, 315.70 and 64.18 is: 96.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.44 : 315.70 = 64.18 : x
  2. Step 2: Convert to fraction form
    210.44/315.70 = 64.18/x
  3. Step 3: Cross multiply
    210.44x = 315.70 × 64.18
  4. Step 4: Simplify right side
    210.44x = 20,261.42
  5. Step 5: Solve for x
    x = 20,261.42/210.44
  6. Step 6: Final answer
    x = 96.28

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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.