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Finding the Fourth Proportional to 210.40, 290.28 and 151.40

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Solution

The fourth proportional to 210.40, 290.28 and 151.40 is: 208.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.40 : 290.28 = 151.40 : x
  2. Step 2: Convert to fraction form
    210.40/290.28 = 151.40/x
  3. Step 3: Cross multiply
    210.40x = 290.28 × 151.40
  4. Step 4: Simplify right side
    210.40x = 43,949.69
  5. Step 5: Solve for x
    x = 43,949.69/210.40
  6. Step 6: Final answer
    x = 208.89

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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.