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Finding the Fourth Proportional to 3,390.96, 5,085.60 and 925.78

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Solution

The fourth proportional to 3,390.96, 5,085.60 and 925.78 is: 1,388.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,390.96 : 5,085.60 = 925.78 : x
  2. Step 2: Convert to fraction form
    3,390.96/5,085.60 = 925.78/x
  3. Step 3: Cross multiply
    3,390.96x = 5,085.60 × 925.78
  4. Step 4: Simplify right side
    3,390.96x = 4,708,146.77
  5. Step 5: Solve for x
    x = 4,708,146.77/3,390.96
  6. Step 6: Final answer
    x = 1,388.44

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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.