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Finding the Fourth Proportional to 402.48, 555.73 and 309.08

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Solution

The fourth proportional to 402.48, 555.73 and 309.08 is: 426.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.48 : 555.73 = 309.08 : x
  2. Step 2: Convert to fraction form
    402.48/555.73 = 309.08/x
  3. Step 3: Cross multiply
    402.48x = 555.73 × 309.08
  4. Step 4: Simplify right side
    402.48x = 171,763.02
  5. Step 5: Solve for x
    x = 171,763.02/402.48
  6. Step 6: Final answer
    x = 426.76

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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.