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Finding the Fourth Proportional to 3,320.72, 4,981.74 and 980.76

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Solution

The fourth proportional to 3,320.72, 4,981.74 and 980.76 is: 1,471.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,320.72 : 4,981.74 = 980.76 : x
  2. Step 2: Convert to fraction form
    3,320.72/4,981.74 = 980.76/x
  3. Step 3: Cross multiply
    3,320.72x = 4,981.74 × 980.76
  4. Step 4: Simplify right side
    3,320.72x = 4,885,906.33
  5. Step 5: Solve for x
    x = 4,885,906.33/3,320.72
  6. Step 6: Final answer
    x = 1,471.34

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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.