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Finding the Fourth Proportional to 555.57, 765.74 and 389.48

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Solution

The fourth proportional to 555.57, 765.74 and 389.48 is: 536.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    555.57 : 765.74 = 389.48 : x
  2. Step 2: Convert to fraction form
    555.57/765.74 = 389.48/x
  3. Step 3: Cross multiply
    555.57x = 765.74 × 389.48
  4. Step 4: Simplify right side
    555.57x = 298,240.42
  5. Step 5: Solve for x
    x = 298,240.42/555.57
  6. Step 6: Final answer
    x = 536.82

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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.