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Finding the Fourth Proportional to 128,807.69, 177,712.11 and 77,801.36

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Solution

The fourth proportional to 128,807.69, 177,712.11 and 77,801.36 is: 107,340.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,807.69 : 177,712.11 = 77,801.36 : x
  2. Step 2: Convert to fraction form
    128,807.69/177,712.11 = 77,801.36/x
  3. Step 3: Cross multiply
    128,807.69x = 177,712.11 × 77,801.36
  4. Step 4: Simplify right side
    128,807.69x = 13,826,242,957.91
  5. Step 5: Solve for x
    x = 13,826,242,957.91/128,807.69
  6. Step 6: Final answer
    x = 107,340.20

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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.