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Finding the Fourth Proportional to 85,611.79, 128,423.83 and 26,439.77

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Solution

The fourth proportional to 85,611.79, 128,423.83 and 26,439.77 is: 39,661.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,611.79 : 128,423.83 = 26,439.77 : x
  2. Step 2: Convert to fraction form
    85,611.79/128,423.83 = 26,439.77/x
  3. Step 3: Cross multiply
    85,611.79x = 128,423.83 × 26,439.77
  4. Step 4: Simplify right side
    85,611.79x = 3,395,496,109.87
  5. Step 5: Solve for x
    x = 3,395,496,109.87/85,611.79
  6. Step 6: Final answer
    x = 39,661.55

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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.