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Finding the Fourth Proportional to 85,825.63, 128,738.45 and 70,013.62

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Solution

The fourth proportional to 85,825.63, 128,738.45 and 70,013.62 is: 105,020.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,825.63 : 128,738.45 = 70,013.62 : x
  2. Step 2: Convert to fraction form
    85,825.63/128,738.45 = 70,013.62/x
  3. Step 3: Cross multiply
    85,825.63x = 128,738.45 × 70,013.62
  4. Step 4: Simplify right side
    85,825.63x = 9,013,444,917.69
  5. Step 5: Solve for x
    x = 9,013,444,917.69/85,825.63
  6. Step 6: Final answer
    x = 105,020.43

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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.