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Finding the Fourth Proportional to 3,390.91, 5,085.55 and 925.74

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Solution

The fourth proportional to 3,390.91, 5,085.55 and 925.74 is: 1,388.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,390.91 : 5,085.55 = 925.74 : x
  2. Step 2: Convert to fraction form
    3,390.91/5,085.55 = 925.74/x
  3. Step 3: Cross multiply
    3,390.91x = 5,085.55 × 925.74
  4. Step 4: Simplify right side
    3,390.91x = 4,707,897.06
  5. Step 5: Solve for x
    x = 4,707,897.06/3,390.91
  6. Step 6: Final answer
    x = 1,388.39

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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.