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Finding the Fourth Proportional to 3,390.30, 5,085.29 and 891.42

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Solution

The fourth proportional to 3,390.30, 5,085.29 and 891.42 is: 1,337.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,390.30 : 5,085.29 = 891.42 : x
  2. Step 2: Convert to fraction form
    3,390.30/5,085.29 = 891.42/x
  3. Step 3: Cross multiply
    3,390.30x = 5,085.29 × 891.42
  4. Step 4: Simplify right side
    3,390.30x = 4,533,124.75
  5. Step 5: Solve for x
    x = 4,533,124.75/3,390.30
  6. Step 6: Final answer
    x = 1,337.09

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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.