Home / 138,668.42-191,345.94-78,235.53

Finding the Fourth Proportional to 138,668.42, 191,345.94 and 78,235.53

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Solution

The fourth proportional to 138,668.42, 191,345.94 and 78,235.53 is: 107,955.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,668.42 : 191,345.94 = 78,235.53 : x
  2. Step 2: Convert to fraction form
    138,668.42/191,345.94 = 78,235.53/x
  3. Step 3: Cross multiply
    138,668.42x = 191,345.94 × 78,235.53
  4. Step 4: Simplify right side
    138,668.42x = 14,970,051,029.25
  5. Step 5: Solve for x
    x = 14,970,051,029.25/138,668.42
  6. Step 6: Final answer
    x = 107,955.74

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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.