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Finding the Fourth Proportional to 6,990.84, 9,639.36 and 5,219.46

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Solution

The fourth proportional to 6,990.84, 9,639.36 and 5,219.46 is: 7,196.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,990.84 : 9,639.36 = 5,219.46 : x
  2. Step 2: Convert to fraction form
    6,990.84/9,639.36 = 5,219.46/x
  3. Step 3: Cross multiply
    6,990.84x = 9,639.36 × 5,219.46
  4. Step 4: Simplify right side
    6,990.84x = 50,312,253.95
  5. Step 5: Solve for x
    x = 50,312,253.95/6,990.84
  6. Step 6: Final answer
    x = 7,196.88

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.