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Finding the Fourth Proportional to 555.68, 767.22 and 390.44

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Solution

The fourth proportional to 555.68, 767.22 and 390.44 is: 539.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    555.68 : 767.22 = 390.44 : x
  2. Step 2: Convert to fraction form
    555.68/767.22 = 390.44/x
  3. Step 3: Cross multiply
    555.68x = 767.22 × 390.44
  4. Step 4: Simplify right side
    555.68x = 299,553.38
  5. Step 5: Solve for x
    x = 299,553.38/555.68
  6. Step 6: Final answer
    x = 539.08

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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.