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Finding the Fourth Proportional to 210.40, 315.50 and 73.42

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Solution

The fourth proportional to 210.40, 315.50 and 73.42 is: 110.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.40 : 315.50 = 73.42 : x
  2. Step 2: Convert to fraction form
    210.40/315.50 = 73.42/x
  3. Step 3: Cross multiply
    210.40x = 315.50 × 73.42
  4. Step 4: Simplify right side
    210.40x = 23,164.01
  5. Step 5: Solve for x
    x = 23,164.01/210.40
  6. Step 6: Final answer
    x = 110.10

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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.