Home / 4,989.80-7,484.70-4,428.20

Finding the Fourth Proportional to 4,989.80, 7,484.70 and 4,428.20

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Solution

The fourth proportional to 4,989.80, 7,484.70 and 4,428.20 is: 6,642.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,989.80 : 7,484.70 = 4,428.20 : x
  2. Step 2: Convert to fraction form
    4,989.80/7,484.70 = 4,428.20/x
  3. Step 3: Cross multiply
    4,989.80x = 7,484.70 × 4,428.20
  4. Step 4: Simplify right side
    4,989.80x = 33,143,748.54
  5. Step 5: Solve for x
    x = 33,143,748.54/4,989.80
  6. Step 6: Final answer
    x = 6,642.30

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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.