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Finding the Fourth Proportional to 210.57, 290.72 and 135.91

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Solution

The fourth proportional to 210.57, 290.72 and 135.91 is: 187.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.57 : 290.72 = 135.91 : x
  2. Step 2: Convert to fraction form
    210.57/290.72 = 135.91/x
  3. Step 3: Cross multiply
    210.57x = 290.72 × 135.91
  4. Step 4: Simplify right side
    210.57x = 39,510.86
  5. Step 5: Solve for x
    x = 39,510.86/210.57
  6. Step 6: Final answer
    x = 187.64

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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.