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Finding the Fourth Proportional to 521.83, 783.18 and 278.53

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Solution

The fourth proportional to 521.83, 783.18 and 278.53 is: 418.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.83 : 783.18 = 278.53 : x
  2. Step 2: Convert to fraction form
    521.83/783.18 = 278.53/x
  3. Step 3: Cross multiply
    521.83x = 783.18 × 278.53
  4. Step 4: Simplify right side
    521.83x = 218,139.13
  5. Step 5: Solve for x
    x = 218,139.13/521.83
  6. Step 6: Final answer
    x = 418.03

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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.