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Finding the Fourth Proportional to 128,708.16, 193,117.20 and 66,422.40

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Solution

The fourth proportional to 128,708.16, 193,117.20 and 66,422.40 is: 99,661.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,708.16 : 193,117.20 = 66,422.40 : x
  2. Step 2: Convert to fraction form
    128,708.16/193,117.20 = 66,422.40/x
  3. Step 3: Cross multiply
    128,708.16x = 193,117.20 × 66,422.40
  4. Step 4: Simplify right side
    128,708.16x = 12,827,307,905.28
  5. Step 5: Solve for x
    x = 12,827,307,905.28/128,708.16
  6. Step 6: Final answer
    x = 99,661.96

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.