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Finding the Fourth Proportional to 128,171.78, 176,892.08 and 77,210.24

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Solution

The fourth proportional to 128,171.78, 176,892.08 and 77,210.24 is: 106,559.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,171.78 : 176,892.08 = 77,210.24 : x
  2. Step 2: Convert to fraction form
    128,171.78/176,892.08 = 77,210.24/x
  3. Step 3: Cross multiply
    128,171.78x = 176,892.08 × 77,210.24
  4. Step 4: Simplify right side
    128,171.78x = 13,657,879,066.44
  5. Step 5: Solve for x
    x = 13,657,879,066.44/128,171.78
  6. Step 6: Final answer
    x = 106,559.18

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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.