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Finding the Fourth Proportional to 128,910.90, 177,898.26 and 72,323.48

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Solution

The fourth proportional to 128,910.90, 177,898.26 and 72,323.48 is: 99,807.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,910.90 : 177,898.26 = 72,323.48 : x
  2. Step 2: Convert to fraction form
    128,910.90/177,898.26 = 72,323.48/x
  3. Step 3: Cross multiply
    128,910.90x = 177,898.26 × 72,323.48
  4. Step 4: Simplify right side
    128,910.90x = 12,866,221,249.14
  5. Step 5: Solve for x
    x = 12,866,221,249.14/128,910.90
  6. Step 6: Final answer
    x = 99,807.09

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1.5x scale

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.