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Finding the Fourth Proportional to 92,815, 139,364.64 and 81,814.40

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Solution

The fourth proportional to 92,815, 139,364.64 and 81,814.40 is: 122,846.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,815 : 139,364.64 = 81,814.40 : x
  2. Step 2: Convert to fraction form
    92,815/139,364.64 = 81,814.40/x
  3. Step 3: Cross multiply
    92,815x = 139,364.64 × 81,814.40
  4. Step 4: Simplify right side
    92,815x = 11,402,034,402.82
  5. Step 5: Solve for x
    x = 11,402,034,402.82/92,815
  6. Step 6: Final answer
    x = 122,846.89

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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.