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Finding the Fourth Proportional to 555.40, 766.72 and 378.46

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Solution

The fourth proportional to 555.40, 766.72 and 378.46 is: 522.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    555.40 : 766.72 = 378.46 : x
  2. Step 2: Convert to fraction form
    555.40/766.72 = 378.46/x
  3. Step 3: Cross multiply
    555.40x = 766.72 × 378.46
  4. Step 4: Simplify right side
    555.40x = 290,172.85
  5. Step 5: Solve for x
    x = 290,172.85/555.40
  6. Step 6: Final answer
    x = 522.46

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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.