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Finding the Fourth Proportional to 3,612.84, 5,419.63 and 980.39

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Solution

The fourth proportional to 3,612.84, 5,419.63 and 980.39 is: 1,470.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,612.84 : 5,419.63 = 980.39 : x
  2. Step 2: Convert to fraction form
    3,612.84/5,419.63 = 980.39/x
  3. Step 3: Cross multiply
    3,612.84x = 5,419.63 × 980.39
  4. Step 4: Simplify right side
    3,612.84x = 5,313,356.83
  5. Step 5: Solve for x
    x = 5,313,356.83/3,612.84
  6. Step 6: Final answer
    x = 1,470.69

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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.