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Finding the Fourth Proportional to 925.59, 1,388.75 and 439.05

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Solution

The fourth proportional to 925.59, 1,388.75 and 439.05 is: 658.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    925.59 : 1,388.75 = 439.05 : x
  2. Step 2: Convert to fraction form
    925.59/1,388.75 = 439.05/x
  3. Step 3: Cross multiply
    925.59x = 1,388.75 × 439.05
  4. Step 4: Simplify right side
    925.59x = 609,728.49
  5. Step 5: Solve for x
    x = 609,728.49/925.59
  6. Step 6: Final answer
    x = 658.75

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1.5x scale

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.