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Finding the Fourth Proportional to 402.47, 555.48 and 320.20

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Solution

The fourth proportional to 402.47, 555.48 and 320.20 is: 441.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.47 : 555.48 = 320.20 : x
  2. Step 2: Convert to fraction form
    402.47/555.48 = 320.20/x
  3. Step 3: Cross multiply
    402.47x = 555.48 × 320.20
  4. Step 4: Simplify right side
    402.47x = 177,864.70
  5. Step 5: Solve for x
    x = 177,864.70/402.47
  6. Step 6: Final answer
    x = 441.93

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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.