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Finding the Fourth Proportional to 555.18, 766.30 and 389.43

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Solution

The fourth proportional to 555.18, 766.30 and 389.43 is: 537.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    555.18 : 766.30 = 389.43 : x
  2. Step 2: Convert to fraction form
    555.18/766.30 = 389.43/x
  3. Step 3: Cross multiply
    555.18x = 766.30 × 389.43
  4. Step 4: Simplify right side
    555.18x = 298,420.21
  5. Step 5: Solve for x
    x = 298,420.21/555.18
  6. Step 6: Final answer
    x = 537.52

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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.