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Finding the Fourth Proportional to 547.68, 755.44 and 390.12

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Solution

The fourth proportional to 547.68, 755.44 and 390.12 is: 538.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    547.68 : 755.44 = 390.12 : x
  2. Step 2: Convert to fraction form
    547.68/755.44 = 390.12/x
  3. Step 3: Cross multiply
    547.68x = 755.44 × 390.12
  4. Step 4: Simplify right side
    547.68x = 294,712.25
  5. Step 5: Solve for x
    x = 294,712.25/547.68
  6. Step 6: Final answer
    x = 538.11

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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.