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Finding the Fourth Proportional to 92,810.60, 128,012.48 and 85,178.47

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Solution

The fourth proportional to 92,810.60, 128,012.48 and 85,178.47 is: 117,485.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,810.60 : 128,012.48 = 85,178.47 : x
  2. Step 2: Convert to fraction form
    92,810.60/128,012.48 = 85,178.47/x
  3. Step 3: Cross multiply
    92,810.60x = 128,012.48 × 85,178.47
  4. Step 4: Simplify right side
    92,810.60x = 10,903,906,491.23
  5. Step 5: Solve for x
    x = 10,903,906,491.23/92,810.60
  6. Step 6: Final answer
    x = 117,485.57

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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.