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Finding the Fourth Proportional to 138,762.60, 191,492.99 and 78,333.96

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Solution

The fourth proportional to 138,762.60, 191,492.99 and 78,333.96 is: 108,101.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,762.60 : 191,492.99 = 78,333.96 : x
  2. Step 2: Convert to fraction form
    138,762.60/191,492.99 = 78,333.96/x
  3. Step 3: Cross multiply
    138,762.60x = 191,492.99 × 78,333.96
  4. Step 4: Simplify right side
    138,762.60x = 15,000,404,218.94
  5. Step 5: Solve for x
    x = 15,000,404,218.94/138,762.60
  6. Step 6: Final answer
    x = 108,101.20

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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.