Home / 138,944.34-191,739.60-78,521.40

Finding the Fourth Proportional to 138,944.34, 191,739.60 and 78,521.40

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Solution

The fourth proportional to 138,944.34, 191,739.60 and 78,521.40 is: 108,357.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,944.34 : 191,739.60 = 78,521.40 : x
  2. Step 2: Convert to fraction form
    138,944.34/191,739.60 = 78,521.40/x
  3. Step 3: Cross multiply
    138,944.34x = 191,739.60 × 78,521.40
  4. Step 4: Simplify right side
    138,944.34x = 15,055,661,827.44
  5. Step 5: Solve for x
    x = 15,055,661,827.44/138,944.34
  6. Step 6: Final answer
    x = 108,357.50

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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.