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Finding the Fourth Proportional to 128,420.69, 177,210.92 and 71,821.13

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Solution

The fourth proportional to 128,420.69, 177,210.92 and 71,821.13 is: 99,107.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,420.69 : 177,210.92 = 71,821.13 : x
  2. Step 2: Convert to fraction form
    128,420.69/177,210.92 = 71,821.13/x
  3. Step 3: Cross multiply
    128,420.69x = 177,210.92 × 71,821.13
  4. Step 4: Simplify right side
    128,420.69x = 12,727,487,816.24
  5. Step 5: Solve for x
    x = 12,727,487,816.24/128,420.69
  6. Step 6: Final answer
    x = 99,107.77

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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.