Home / 78,189.13-107,900.39-42,378.22

Finding the Fourth Proportional to 78,189.13, 107,900.39 and 42,378.22

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Solution

The fourth proportional to 78,189.13, 107,900.39 and 42,378.22 is: 58,481.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,189.13 : 107,900.39 = 42,378.22 : x
  2. Step 2: Convert to fraction form
    78,189.13/107,900.39 = 42,378.22/x
  3. Step 3: Cross multiply
    78,189.13x = 107,900.39 × 42,378.22
  4. Step 4: Simplify right side
    78,189.13x = 4,572,625,714.11
  5. Step 5: Solve for x
    x = 4,572,625,714.11/78,189.13
  6. Step 6: Final answer
    x = 58,481.61

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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.