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Finding the Fourth Proportional to 210.42, 290.35 and 117.15

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Solution

The fourth proportional to 210.42, 290.35 and 117.15 is: 161.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.42 : 290.35 = 117.15 : x
  2. Step 2: Convert to fraction form
    210.42/290.35 = 117.15/x
  3. Step 3: Cross multiply
    210.42x = 290.35 × 117.15
  4. Step 4: Simplify right side
    210.42x = 34,014.50
  5. Step 5: Solve for x
    x = 34,014.50/210.42
  6. Step 6: Final answer
    x = 161.65

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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.