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Finding the Fourth Proportional to 85,363.72, 128,043.90 and 38,583.88

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Solution

The fourth proportional to 85,363.72, 128,043.90 and 38,583.88 is: 57,875.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,363.72 : 128,043.90 = 38,583.88 : x
  2. Step 2: Convert to fraction form
    85,363.72/128,043.90 = 38,583.88/x
  3. Step 3: Cross multiply
    85,363.72x = 128,043.90 × 38,583.88
  4. Step 4: Simplify right side
    85,363.72x = 4,940,430,472.33
  5. Step 5: Solve for x
    x = 4,940,430,472.33/85,363.72
  6. Step 6: Final answer
    x = 57,875.06

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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.