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Finding the Fourth Proportional to 342.61, 512.80 and 186.20

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Solution

The fourth proportional to 342.61, 512.80 and 186.20 is: 278.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    342.61 : 512.80 = 186.20 : x
  2. Step 2: Convert to fraction form
    342.61/512.80 = 186.20/x
  3. Step 3: Cross multiply
    342.61x = 512.80 × 186.20
  4. Step 4: Simplify right side
    342.61x = 95,482.43
  5. Step 5: Solve for x
    x = 95,482.43/342.61
  6. Step 6: Final answer
    x = 278.69

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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.