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Finding the Fourth Proportional to 555.72, 766.44 and 390.48

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Solution

The fourth proportional to 555.72, 766.44 and 390.48 is: 538.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    555.72 : 766.44 = 390.48 : x
  2. Step 2: Convert to fraction form
    555.72/766.44 = 390.48/x
  3. Step 3: Cross multiply
    555.72x = 766.44 × 390.48
  4. Step 4: Simplify right side
    555.72x = 299,279.49
  5. Step 5: Solve for x
    x = 299,279.49/555.72
  6. Step 6: Final answer
    x = 538.54

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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.