Home / 5,378.84-7,421.50-3,139.44

Finding the Fourth Proportional to 5,378.84, 7,421.50 and 3,139.44

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Solution

The fourth proportional to 5,378.84, 7,421.50 and 3,139.44 is: 4,331.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,378.84 : 7,421.50 = 3,139.44 : x
  2. Step 2: Convert to fraction form
    5,378.84/7,421.50 = 3,139.44/x
  3. Step 3: Cross multiply
    5,378.84x = 7,421.50 × 3,139.44
  4. Step 4: Simplify right side
    5,378.84x = 23,299,301.16
  5. Step 5: Solve for x
    x = 23,299,301.16/5,378.84
  6. Step 6: Final answer
    x = 4,331.66

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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.