Home / 7,138.72-9,850.98-4,155.40

Finding the Fourth Proportional to 7,138.72, 9,850.98 and 4,155.40

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Solution

The fourth proportional to 7,138.72, 9,850.98 and 4,155.40 is: 5,734.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,138.72 : 9,850.98 = 4,155.40 : x
  2. Step 2: Convert to fraction form
    7,138.72/9,850.98 = 4,155.40/x
  3. Step 3: Cross multiply
    7,138.72x = 9,850.98 × 4,155.40
  4. Step 4: Simplify right side
    7,138.72x = 40,934,762.29
  5. Step 5: Solve for x
    x = 40,934,762.29/7,138.72
  6. Step 6: Final answer
    x = 5,734.19

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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.