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Finding the Fourth Proportional to 342.72, 511.69 and 291.39

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Solution

The fourth proportional to 342.72, 511.69 and 291.39 is: 435.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    342.72 : 511.69 = 291.39 : x
  2. Step 2: Convert to fraction form
    342.72/511.69 = 291.39/x
  3. Step 3: Cross multiply
    342.72x = 511.69 × 291.39
  4. Step 4: Simplify right side
    342.72x = 149,101.35
  5. Step 5: Solve for x
    x = 149,101.35/342.72
  6. Step 6: Final answer
    x = 435.05

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.