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Finding the Fourth Proportional to 85,869.20, 128,813.40 and 26,704.40

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Solution

The fourth proportional to 85,869.20, 128,813.40 and 26,704.40 is: 40,059.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,869.20 : 128,813.40 = 26,704.40 : x
  2. Step 2: Convert to fraction form
    85,869.20/128,813.40 = 26,704.40/x
  3. Step 3: Cross multiply
    85,869.20x = 128,813.40 × 26,704.40
  4. Step 4: Simplify right side
    85,869.20x = 3,439,884,558.96
  5. Step 5: Solve for x
    x = 3,439,884,558.96/85,869.20
  6. Step 6: Final answer
    x = 40,059.59

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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.