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Finding the Fourth Proportional to 7,139.16, 10,708.79 and 1,945.08

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Solution

The fourth proportional to 7,139.16, 10,708.79 and 1,945.08 is: 2,917.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,139.16 : 10,708.79 = 1,945.08 : x
  2. Step 2: Convert to fraction form
    7,139.16/10,708.79 = 1,945.08/x
  3. Step 3: Cross multiply
    7,139.16x = 10,708.79 × 1,945.08
  4. Step 4: Simplify right side
    7,139.16x = 20,829,443.53
  5. Step 5: Solve for x
    x = 20,829,443.53/7,139.16
  6. Step 6: Final answer
    x = 2,917.63

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.