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Finding the Fourth Proportional to 210.19, 290.45 and 151.87

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Solution

The fourth proportional to 210.19, 290.45 and 151.87 is: 209.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.19 : 290.45 = 151.87 : x
  2. Step 2: Convert to fraction form
    210.19/290.45 = 151.87/x
  3. Step 3: Cross multiply
    210.19x = 290.45 × 151.87
  4. Step 4: Simplify right side
    210.19x = 44,110.64
  5. Step 5: Solve for x
    x = 44,110.64/210.19
  6. Step 6: Final answer
    x = 209.86

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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.