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Finding the Fourth Proportional to 210.79, 291.17 and 145.18

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Solution

The fourth proportional to 210.79, 291.17 and 145.18 is: 200.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.79 : 291.17 = 145.18 : x
  2. Step 2: Convert to fraction form
    210.79/291.17 = 145.18/x
  3. Step 3: Cross multiply
    210.79x = 291.17 × 145.18
  4. Step 4: Simplify right side
    210.79x = 42,272.06
  5. Step 5: Solve for x
    x = 42,272.06/210.79
  6. Step 6: Final answer
    x = 200.54

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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.