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Finding the Fourth Proportional to 353.43, 487.08 and 309.08

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Solution

The fourth proportional to 353.43, 487.08 and 309.08 is: 425.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    353.43 : 487.08 = 309.08 : x
  2. Step 2: Convert to fraction form
    353.43/487.08 = 309.08/x
  3. Step 3: Cross multiply
    353.43x = 487.08 × 309.08
  4. Step 4: Simplify right side
    353.43x = 150,547.90
  5. Step 5: Solve for x
    x = 150,547.90/353.43
  6. Step 6: Final answer
    x = 425.96

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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.