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Finding the Fourth Proportional to 91,873.65, 126,492.36 and 78,390.79

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Solution

The fourth proportional to 91,873.65, 126,492.36 and 78,390.79 is: 107,929.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,873.65 : 126,492.36 = 78,390.79 : x
  2. Step 2: Convert to fraction form
    91,873.65/126,492.36 = 78,390.79/x
  3. Step 3: Cross multiply
    91,873.65x = 126,492.36 × 78,390.79
  4. Step 4: Simplify right side
    91,873.65x = 9,915,835,893.51
  5. Step 5: Solve for x
    x = 9,915,835,893.51/91,873.65
  6. Step 6: Final answer
    x = 107,929.06

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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.