Home / 12,971.28-17,900.70-7,935.40

Finding the Fourth Proportional to 12,971.28, 17,900.70 and 7,935.40

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Solution

The fourth proportional to 12,971.28, 17,900.70 and 7,935.40 is: 10,951.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,971.28 : 17,900.70 = 7,935.40 : x
  2. Step 2: Convert to fraction form
    12,971.28/17,900.70 = 7,935.40/x
  3. Step 3: Cross multiply
    12,971.28x = 17,900.70 × 7,935.40
  4. Step 4: Simplify right side
    12,971.28x = 142,049,214.78
  5. Step 5: Solve for x
    x = 142,049,214.78/12,971.28
  6. Step 6: Final answer
    x = 10,951.06

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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.