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Finding the Fourth Proportional to 202.09, 302.88 and 86.40

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Solution

The fourth proportional to 202.09, 302.88 and 86.40 is: 129.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    202.09 : 302.88 = 86.40 : x
  2. Step 2: Convert to fraction form
    202.09/302.88 = 86.40/x
  3. Step 3: Cross multiply
    202.09x = 302.88 × 86.40
  4. Step 4: Simplify right side
    202.09x = 26,168.83
  5. Step 5: Solve for x
    x = 26,168.83/202.09
  6. Step 6: Final answer
    x = 129.49

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.