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Finding the Fourth Proportional to 85,728.51, 128,545.85 and 68,072.58

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Solution

The fourth proportional to 85,728.51, 128,545.85 and 68,072.58 is: 102,071.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,728.51 : 128,545.85 = 68,072.58 : x
  2. Step 2: Convert to fraction form
    85,728.51/128,545.85 = 68,072.58/x
  3. Step 3: Cross multiply
    85,728.51x = 128,545.85 × 68,072.58
  4. Step 4: Simplify right side
    85,728.51x = 8,750,447,317.43
  5. Step 5: Solve for x
    x = 8,750,447,317.43/85,728.51
  6. Step 6: Final answer
    x = 102,071.61

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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.