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Finding the Fourth Proportional to 85,657.38, 128,498.40 and 26,497.64

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Solution

The fourth proportional to 85,657.38, 128,498.40 and 26,497.64 is: 39,750.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,657.38 : 128,498.40 = 26,497.64 : x
  2. Step 2: Convert to fraction form
    85,657.38/128,498.40 = 26,497.64/x
  3. Step 3: Cross multiply
    85,657.38x = 128,498.40 × 26,497.64
  4. Step 4: Simplify right side
    85,657.38x = 3,404,904,343.78
  5. Step 5: Solve for x
    x = 3,404,904,343.78/85,657.38
  6. Step 6: Final answer
    x = 39,750.27

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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.