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Finding the Fourth Proportional to 100,879.04, 139,166.28 and 65,080.56

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Solution

The fourth proportional to 100,879.04, 139,166.28 and 65,080.56 is: 89,780.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,879.04 : 139,166.28 = 65,080.56 : x
  2. Step 2: Convert to fraction form
    100,879.04/139,166.28 = 65,080.56/x
  3. Step 3: Cross multiply
    100,879.04x = 139,166.28 × 65,080.56
  4. Step 4: Simplify right side
    100,879.04x = 9,057,019,435.52
  5. Step 5: Solve for x
    x = 9,057,019,435.52/100,879.04
  6. Step 6: Final answer
    x = 89,780.98

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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.