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Finding the Fourth Proportional to 925.90, 1,387.93 and 535.78

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Solution

The fourth proportional to 925.90, 1,387.93 and 535.78 is: 803.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    925.90 : 1,387.93 = 535.78 : x
  2. Step 2: Convert to fraction form
    925.90/1,387.93 = 535.78/x
  3. Step 3: Cross multiply
    925.90x = 1,387.93 × 535.78
  4. Step 4: Simplify right side
    925.90x = 743,625.14
  5. Step 5: Solve for x
    x = 743,625.14/925.90
  6. Step 6: Final answer
    x = 803.14

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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.