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Finding the Fourth Proportional to 521.87, 720.72 and 356.51

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Solution

The fourth proportional to 521.87, 720.72 and 356.51 is: 492.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.87 : 720.72 = 356.51 : x
  2. Step 2: Convert to fraction form
    521.87/720.72 = 356.51/x
  3. Step 3: Cross multiply
    521.87x = 720.72 × 356.51
  4. Step 4: Simplify right side
    521.87x = 256,940.28
  5. Step 5: Solve for x
    x = 256,940.28/521.87
  6. Step 6: Final answer
    x = 492.35

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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.