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Finding the Fourth Proportional to 210.63, 290.52 and 136.81

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Solution

The fourth proportional to 210.63, 290.52 and 136.81 is: 188.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.63 : 290.52 = 136.81 : x
  2. Step 2: Convert to fraction form
    210.63/290.52 = 136.81/x
  3. Step 3: Cross multiply
    210.63x = 290.52 × 136.81
  4. Step 4: Simplify right side
    210.63x = 39,746.04
  5. Step 5: Solve for x
    x = 39,746.04/210.63
  6. Step 6: Final answer
    x = 188.70

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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.