Home / 138,919.86-191,698.02-78,495.75

Finding the Fourth Proportional to 138,919.86, 191,698.02 and 78,495.75

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Solution

The fourth proportional to 138,919.86, 191,698.02 and 78,495.75 is: 108,317.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,919.86 : 191,698.02 = 78,495.75 : x
  2. Step 2: Convert to fraction form
    138,919.86/191,698.02 = 78,495.75/x
  3. Step 3: Cross multiply
    138,919.86x = 191,698.02 × 78,495.75
  4. Step 4: Simplify right side
    138,919.86x = 15,047,479,853.42
  5. Step 5: Solve for x
    x = 15,047,479,853.42/138,919.86
  6. Step 6: Final answer
    x = 108,317.70

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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.