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Finding the Fourth Proportional to 128,749.58, 193,134.87 and 64,674.77

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Solution

The fourth proportional to 128,749.58, 193,134.87 and 64,674.77 is: 97,017.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,749.58 : 193,134.87 = 64,674.77 : x
  2. Step 2: Convert to fraction form
    128,749.58/193,134.87 = 64,674.77/x
  3. Step 3: Cross multiply
    128,749.58x = 193,134.87 × 64,674.77
  4. Step 4: Simplify right side
    128,749.58x = 12,490,952,330.56
  5. Step 5: Solve for x
    x = 12,490,952,330.56/128,749.58
  6. Step 6: Final answer
    x = 97,017.42

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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.