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Finding the Fourth Proportional to 210.90, 291.22 and 148.86

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Solution

The fourth proportional to 210.90, 291.22 and 148.86 is: 205.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.90 : 291.22 = 148.86 : x
  2. Step 2: Convert to fraction form
    210.90/291.22 = 148.86/x
  3. Step 3: Cross multiply
    210.90x = 291.22 × 148.86
  4. Step 4: Simplify right side
    210.90x = 43,351.01
  5. Step 5: Solve for x
    x = 43,351.01/210.90
  6. Step 6: Final answer
    x = 205.55

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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.