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Finding the Fourth Proportional to 521.23, 780 and 383.95

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Solution

The fourth proportional to 521.23, 780 and 383.95 is: 574.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.23 : 780 = 383.95 : x
  2. Step 2: Convert to fraction form
    521.23/780 = 383.95/x
  3. Step 3: Cross multiply
    521.23x = 780 × 383.95
  4. Step 4: Simplify right side
    521.23x = 299,481
  5. Step 5: Solve for x
    x = 299,481/521.23
  6. Step 6: Final answer
    x = 574.57

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.