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Finding the Fourth Proportional to 555.12, 765.96 and 389.28

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Solution

The fourth proportional to 555.12, 765.96 and 389.28 is: 537.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    555.12 : 765.96 = 389.28 : x
  2. Step 2: Convert to fraction form
    555.12/765.96 = 389.28/x
  3. Step 3: Cross multiply
    555.12x = 765.96 × 389.28
  4. Step 4: Simplify right side
    555.12x = 298,172.91
  5. Step 5: Solve for x
    x = 298,172.91/555.12
  6. Step 6: Final answer
    x = 537.13

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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.