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Finding the Fourth Proportional to 555.20, 766.40 and 358.72

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Solution

The fourth proportional to 555.20, 766.40 and 358.72 is: 495.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    555.20 : 766.40 = 358.72 : x
  2. Step 2: Convert to fraction form
    555.20/766.40 = 358.72/x
  3. Step 3: Cross multiply
    555.20x = 766.40 × 358.72
  4. Step 4: Simplify right side
    555.20x = 274,923.01
  5. Step 5: Solve for x
    x = 274,923.01/555.20
  6. Step 6: Final answer
    x = 495.18

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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.