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Finding the Fourth Proportional to 521.13, 718.79 and 355.08

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Solution

The fourth proportional to 521.13, 718.79 and 355.08 is: 489.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.13 : 718.79 = 355.08 : x
  2. Step 2: Convert to fraction form
    521.13/718.79 = 355.08/x
  3. Step 3: Cross multiply
    521.13x = 718.79 × 355.08
  4. Step 4: Simplify right side
    521.13x = 255,226.18
  5. Step 5: Solve for x
    x = 255,226.18/521.13
  6. Step 6: Final answer
    x = 489.76

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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.