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Finding the Fourth Proportional to 210.95, 291.26 and 136.45

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Solution

The fourth proportional to 210.95, 291.26 and 136.45 is: 188.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.95 : 291.26 = 136.45 : x
  2. Step 2: Convert to fraction form
    210.95/291.26 = 136.45/x
  3. Step 3: Cross multiply
    210.95x = 291.26 × 136.45
  4. Step 4: Simplify right side
    210.95x = 39,741.11
  5. Step 5: Solve for x
    x = 39,741.11/210.95
  6. Step 6: Final answer
    x = 188.39

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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.