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Finding the Fourth Proportional to 522, 783.12 and 278.46

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Solution

The fourth proportional to 522, 783.12 and 278.46 is: 417.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    522 : 783.12 = 278.46 : x
  2. Step 2: Convert to fraction form
    522/783.12 = 278.46/x
  3. Step 3: Cross multiply
    522x = 783.12 × 278.46
  4. Step 4: Simplify right side
    522x = 218,067.60
  5. Step 5: Solve for x
    x = 218,067.60/522
  6. Step 6: Final answer
    x = 417.75

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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.