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Finding the Fourth Proportional to 652.78, 900.84 and 390.73

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Solution

The fourth proportional to 652.78, 900.84 and 390.73 is: 539.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    652.78 : 900.84 = 390.73 : x
  2. Step 2: Convert to fraction form
    652.78/900.84 = 390.73/x
  3. Step 3: Cross multiply
    652.78x = 900.84 × 390.73
  4. Step 4: Simplify right side
    652.78x = 351,985.21
  5. Step 5: Solve for x
    x = 351,985.21/652.78
  6. Step 6: Final answer
    x = 539.21

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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.