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Finding the Fourth Proportional to 3,412.85, 5,119.37 and 947.85

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Solution

The fourth proportional to 3,412.85, 5,119.37 and 947.85 is: 1,421.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,412.85 : 5,119.37 = 947.85 : x
  2. Step 2: Convert to fraction form
    3,412.85/5,119.37 = 947.85/x
  3. Step 3: Cross multiply
    3,412.85x = 5,119.37 × 947.85
  4. Step 4: Simplify right side
    3,412.85x = 4,852,364.52
  5. Step 5: Solve for x
    x = 4,852,364.52/3,412.85
  6. Step 6: Final answer
    x = 1,421.79

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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.