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Finding the Fourth Proportional to 555.58, 766.30 and 389.83

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Solution

The fourth proportional to 555.58, 766.30 and 389.83 is: 537.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    555.58 : 766.30 = 389.83 : x
  2. Step 2: Convert to fraction form
    555.58/766.30 = 389.83/x
  3. Step 3: Cross multiply
    555.58x = 766.30 × 389.83
  4. Step 4: Simplify right side
    555.58x = 298,726.73
  5. Step 5: Solve for x
    x = 298,726.73/555.58
  6. Step 6: Final answer
    x = 537.68

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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.