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Finding the Fourth Proportional to 521.02, 780.45 and 382.10

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Solution

The fourth proportional to 521.02, 780.45 and 382.10 is: 572.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.02 : 780.45 = 382.10 : x
  2. Step 2: Convert to fraction form
    521.02/780.45 = 382.10/x
  3. Step 3: Cross multiply
    521.02x = 780.45 × 382.10
  4. Step 4: Simplify right side
    521.02x = 298,209.95
  5. Step 5: Solve for x
    x = 298,209.95/521.02
  6. Step 6: Final answer
    x = 572.36

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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.