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Finding the Fourth Proportional to 210.95, 291.29 and 145.61

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Solution

The fourth proportional to 210.95, 291.29 and 145.61 is: 201.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.95 : 291.29 = 145.61 : x
  2. Step 2: Convert to fraction form
    210.95/291.29 = 145.61/x
  3. Step 3: Cross multiply
    210.95x = 291.29 × 145.61
  4. Step 4: Simplify right side
    210.95x = 42,412.55
  5. Step 5: Solve for x
    x = 42,412.55/210.95
  6. Step 6: Final answer
    x = 201.06

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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.