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Finding the Fourth Proportional to 128,699.08, 192,917.40 and 78,748

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Solution

The fourth proportional to 128,699.08, 192,917.40 and 78,748 is: 118,041.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,699.08 : 192,917.40 = 78,748 : x
  2. Step 2: Convert to fraction form
    128,699.08/192,917.40 = 78,748/x
  3. Step 3: Cross multiply
    128,699.08x = 192,917.40 × 78,748
  4. Step 4: Simplify right side
    128,699.08x = 15,191,859,415.20
  5. Step 5: Solve for x
    x = 15,191,859,415.20/128,699.08
  6. Step 6: Final answer
    x = 118,041.71

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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.