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Finding the Fourth Proportional to 85,744.91, 128,386.97 and 69,884.93

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Solution

The fourth proportional to 85,744.91, 128,386.97 and 69,884.93 is: 104,639.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,744.91 : 128,386.97 = 69,884.93 : x
  2. Step 2: Convert to fraction form
    85,744.91/128,386.97 = 69,884.93/x
  3. Step 3: Cross multiply
    85,744.91x = 128,386.97 × 69,884.93
  4. Step 4: Simplify right side
    85,744.91x = 8,972,314,061.94
  5. Step 5: Solve for x
    x = 8,972,314,061.94/85,744.91
  6. Step 6: Final answer
    x = 104,639.61

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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.