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Finding the Fourth Proportional to 555.20, 778.90 and 555.20

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Solution

The fourth proportional to 555.20, 778.90 and 555.20 is: 778.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    555.20 : 778.90 = 555.20 : x
  2. Step 2: Convert to fraction form
    555.20/778.90 = 555.20/x
  3. Step 3: Cross multiply
    555.20x = 778.90 × 555.20
  4. Step 4: Simplify right side
    555.20x = 432,445.28
  5. Step 5: Solve for x
    x = 432,445.28/555.20
  6. Step 6: Final answer
    x = 778.90

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.