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Finding the Fourth Proportional to 85,768.59, 128,600.79 and 38,374.86

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Solution

The fourth proportional to 85,768.59, 128,600.79 and 38,374.86 is: 57,538.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,768.59 : 128,600.79 = 38,374.86 : x
  2. Step 2: Convert to fraction form
    85,768.59/128,600.79 = 38,374.86/x
  3. Step 3: Cross multiply
    85,768.59x = 128,600.79 × 38,374.86
  4. Step 4: Simplify right side
    85,768.59x = 4,935,037,312.14
  5. Step 5: Solve for x
    x = 4,935,037,312.14/85,768.59
  6. Step 6: Final answer
    x = 57,538.98

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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.