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Finding the Fourth Proportional to 521.93, 720.47 and 356.30

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Solution

The fourth proportional to 521.93, 720.47 and 356.30 is: 491.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.93 : 720.47 = 356.30 : x
  2. Step 2: Convert to fraction form
    521.93/720.47 = 356.30/x
  3. Step 3: Cross multiply
    521.93x = 720.47 × 356.30
  4. Step 4: Simplify right side
    521.93x = 256,698.08
  5. Step 5: Solve for x
    x = 256,698.08/521.93
  6. Step 6: Final answer
    x = 491.83

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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.