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Finding the Fourth Proportional to 210.36, 290.40 and 132.78

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Solution

The fourth proportional to 210.36, 290.40 and 132.78 is: 183.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.36 : 290.40 = 132.78 : x
  2. Step 2: Convert to fraction form
    210.36/290.40 = 132.78/x
  3. Step 3: Cross multiply
    210.36x = 290.40 × 132.78
  4. Step 4: Simplify right side
    210.36x = 38,559.31
  5. Step 5: Solve for x
    x = 38,559.31/210.36
  6. Step 6: Final answer
    x = 183.30

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.