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Finding the Fourth Proportional to 925.78, 1,388.88 and 309.55

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Solution

The fourth proportional to 925.78, 1,388.88 and 309.55 is: 464.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    925.78 : 1,388.88 = 309.55 : x
  2. Step 2: Convert to fraction form
    925.78/1,388.88 = 309.55/x
  3. Step 3: Cross multiply
    925.78x = 1,388.88 × 309.55
  4. Step 4: Simplify right side
    925.78x = 429,927.80
  5. Step 5: Solve for x
    x = 429,927.80/925.78
  6. Step 6: Final answer
    x = 464.40

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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.