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Finding the Fourth Proportional to 64,905.39, 89,575.79 and 39,405.87

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Solution

The fourth proportional to 64,905.39, 89,575.79 and 39,405.87 is: 54,383.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,905.39 : 89,575.79 = 39,405.87 : x
  2. Step 2: Convert to fraction form
    64,905.39/89,575.79 = 39,405.87/x
  3. Step 3: Cross multiply
    64,905.39x = 89,575.79 × 39,405.87
  4. Step 4: Simplify right side
    64,905.39x = 3,529,811,738.86
  5. Step 5: Solve for x
    x = 3,529,811,738.86/64,905.39
  6. Step 6: Final answer
    x = 54,383.95

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.