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Finding the Fourth Proportional to 925.02, 1,387.80 and 577.80

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Solution

The fourth proportional to 925.02, 1,387.80 and 577.80 is: 866.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    925.02 : 1,387.80 = 577.80 : x
  2. Step 2: Convert to fraction form
    925.02/1,387.80 = 577.80/x
  3. Step 3: Cross multiply
    925.02x = 1,387.80 × 577.80
  4. Step 4: Simplify right side
    925.02x = 801,870.84
  5. Step 5: Solve for x
    x = 801,870.84/925.02
  6. Step 6: Final answer
    x = 866.87

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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.