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Finding the Fourth Proportional to 85,708.44, 128,593.44 and 38,319.48

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Solution

The fourth proportional to 85,708.44, 128,593.44 and 38,319.48 is: 57,492.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,708.44 : 128,593.44 = 38,319.48 : x
  2. Step 2: Convert to fraction form
    85,708.44/128,593.44 = 38,319.48/x
  3. Step 3: Cross multiply
    85,708.44x = 128,593.44 × 38,319.48
  4. Step 4: Simplify right side
    85,708.44x = 4,927,633,752.21
  5. Step 5: Solve for x
    x = 4,927,633,752.21/85,708.44
  6. Step 6: Final answer
    x = 57,492.98

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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.