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Finding the Fourth Proportional to 210.47, 290.45 and 117.23

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Solution

The fourth proportional to 210.47, 290.45 and 117.23 is: 161.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.47 : 290.45 = 117.23 : x
  2. Step 2: Convert to fraction form
    210.47/290.45 = 117.23/x
  3. Step 3: Cross multiply
    210.47x = 290.45 × 117.23
  4. Step 4: Simplify right side
    210.47x = 34,048.29
  5. Step 5: Solve for x
    x = 34,048.29/210.47
  6. Step 6: Final answer
    x = 161.78

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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.