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Finding the Fourth Proportional to 92,814.90, 128,018.40 and 85,182.78

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Solution

The fourth proportional to 92,814.90, 128,018.40 and 85,182.78 is: 117,491.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,814.90 : 128,018.40 = 85,182.78 : x
  2. Step 2: Convert to fraction form
    92,814.90/128,018.40 = 85,182.78/x
  3. Step 3: Cross multiply
    92,814.90x = 128,018.40 × 85,182.78
  4. Step 4: Simplify right side
    92,814.90x = 10,904,963,203.15
  5. Step 5: Solve for x
    x = 10,904,963,203.15/92,814.90
  6. Step 6: Final answer
    x = 117,491.51

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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.