Home / 5,378.40-7,420.89-3,139.00

Finding the Fourth Proportional to 5,378.40, 7,420.89 and 3,139.00

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Solution

The fourth proportional to 5,378.40, 7,420.89 and 3,139.00 is: 4,331.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,378.40 : 7,420.89 = 3,139.00 : x
  2. Step 2: Convert to fraction form
    5,378.40/7,420.89 = 3,139.00/x
  3. Step 3: Cross multiply
    5,378.40x = 7,420.89 × 3,139.00
  4. Step 4: Simplify right side
    5,378.40x = 23,294,166.93
  5. Step 5: Solve for x
    x = 23,294,166.93/5,378.40
  6. Step 6: Final answer
    x = 4,331.06

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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.