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Finding the Fourth Proportional to 85,478.60, 128,235.72 and 26,311.34

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Solution

The fourth proportional to 85,478.60, 128,235.72 and 26,311.34 is: 39,472.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,478.60 : 128,235.72 = 26,311.34 : x
  2. Step 2: Convert to fraction form
    85,478.60/128,235.72 = 26,311.34/x
  3. Step 3: Cross multiply
    85,478.60x = 128,235.72 × 26,311.34
  4. Step 4: Simplify right side
    85,478.60x = 3,374,052,856.33
  5. Step 5: Solve for x
    x = 3,374,052,856.33/85,478.60
  6. Step 6: Final answer
    x = 39,472.49

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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.