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Finding the Fourth Proportional to 128,618.22, 177,499.44 and 77,630.07

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Solution

The fourth proportional to 128,618.22, 177,499.44 and 77,630.07 is: 107,133.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,618.22 : 177,499.44 = 77,630.07 : x
  2. Step 2: Convert to fraction form
    128,618.22/177,499.44 = 77,630.07/x
  3. Step 3: Cross multiply
    128,618.22x = 177,499.44 × 77,630.07
  4. Step 4: Simplify right side
    128,618.22x = 13,779,293,952.16
  5. Step 5: Solve for x
    x = 13,779,293,952.16/128,618.22
  6. Step 6: Final answer
    x = 107,133.30

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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.