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Finding the Fourth Proportional to 100,713.16, 139,004.28 and 76,797.12

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Solution

The fourth proportional to 100,713.16, 139,004.28 and 76,797.12 is: 105,995.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,713.16 : 139,004.28 = 76,797.12 : x
  2. Step 2: Convert to fraction form
    100,713.16/139,004.28 = 76,797.12/x
  3. Step 3: Cross multiply
    100,713.16x = 139,004.28 × 76,797.12
  4. Step 4: Simplify right side
    100,713.16x = 10,675,128,371.67
  5. Step 5: Solve for x
    x = 10,675,128,371.67/100,713.16
  6. Step 6: Final answer
    x = 105,995.37

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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.