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Finding the Fourth Proportional to 402.96, 555.28 and 309.70

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Solution

The fourth proportional to 402.96, 555.28 and 309.70 is: 426.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.96 : 555.28 = 309.70 : x
  2. Step 2: Convert to fraction form
    402.96/555.28 = 309.70/x
  3. Step 3: Cross multiply
    402.96x = 555.28 × 309.70
  4. Step 4: Simplify right side
    402.96x = 171,970.22
  5. Step 5: Solve for x
    x = 171,970.22/402.96
  6. Step 6: Final answer
    x = 426.77

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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.