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Finding the Fourth Proportional to 526.20, 727.44 and 521.28

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Solution

The fourth proportional to 526.20, 727.44 and 521.28 is: 720.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    526.20 : 727.44 = 521.28 : x
  2. Step 2: Convert to fraction form
    526.20/727.44 = 521.28/x
  3. Step 3: Cross multiply
    526.20x = 727.44 × 521.28
  4. Step 4: Simplify right side
    526.20x = 379,199.92
  5. Step 5: Solve for x
    x = 379,199.92/526.20
  6. Step 6: Final answer
    x = 720.64

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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.