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Finding the Fourth Proportional to 85,608.96, 128,443.72 and 38,219.64

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Solution

The fourth proportional to 85,608.96, 128,443.72 and 38,219.64 is: 57,342.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,608.96 : 128,443.72 = 38,219.64 : x
  2. Step 2: Convert to fraction form
    85,608.96/128,443.72 = 38,219.64/x
  3. Step 3: Cross multiply
    85,608.96x = 128,443.72 × 38,219.64
  4. Step 4: Simplify right side
    85,608.96x = 4,909,072,738.66
  5. Step 5: Solve for x
    x = 4,909,072,738.66/85,608.96
  6. Step 6: Final answer
    x = 57,342.98

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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.