Home / 7,143.10-9,857.37-3,999.40

Finding the Fourth Proportional to 7,143.10, 9,857.37 and 3,999.40

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Solution

The fourth proportional to 7,143.10, 9,857.37 and 3,999.40 is: 5,519.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,143.10 : 9,857.37 = 3,999.40 : x
  2. Step 2: Convert to fraction form
    7,143.10/9,857.37 = 3,999.40/x
  3. Step 3: Cross multiply
    7,143.10x = 9,857.37 × 3,999.40
  4. Step 4: Simplify right side
    7,143.10x = 39,423,565.58
  5. Step 5: Solve for x
    x = 39,423,565.58/7,143.10
  6. Step 6: Final answer
    x = 5,519.11

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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.