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Finding the Fourth Proportional to 128,009.06, 176,570.26 and 77,708.06

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Solution

The fourth proportional to 128,009.06, 176,570.26 and 77,708.06 is: 107,187.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,009.06 : 176,570.26 = 77,708.06 : x
  2. Step 2: Convert to fraction form
    128,009.06/176,570.26 = 77,708.06/x
  3. Step 3: Cross multiply
    128,009.06x = 176,570.26 × 77,708.06
  4. Step 4: Simplify right side
    128,009.06x = 13,720,931,475.44
  5. Step 5: Solve for x
    x = 13,720,931,475.44/128,009.06
  6. Step 6: Final answer
    x = 107,187.19

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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.