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Finding the Fourth Proportional to 105,103.80, 157,425.30 and 91,279.80

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Solution

The fourth proportional to 105,103.80, 157,425.30 and 91,279.80 is: 136,719.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    105,103.80 : 157,425.30 = 91,279.80 : x
  2. Step 2: Convert to fraction form
    105,103.80/157,425.30 = 91,279.80/x
  3. Step 3: Cross multiply
    105,103.80x = 157,425.30 × 91,279.80
  4. Step 4: Simplify right side
    105,103.80x = 14,369,749,898.94
  5. Step 5: Solve for x
    x = 14,369,749,898.94/105,103.80
  6. Step 6: Final answer
    x = 136,719.60

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.