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Finding the Fourth Proportional to 85,814.70, 128,731.65 and 26,649.90

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Solution

The fourth proportional to 85,814.70, 128,731.65 and 26,649.90 is: 39,977.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,814.70 : 128,731.65 = 26,649.90 : x
  2. Step 2: Convert to fraction form
    85,814.70/128,731.65 = 26,649.90/x
  3. Step 3: Cross multiply
    85,814.70x = 128,731.65 × 26,649.90
  4. Step 4: Simplify right side
    85,814.70x = 3,430,685,599.34
  5. Step 5: Solve for x
    x = 3,430,685,599.34/85,814.70
  6. Step 6: Final answer
    x = 39,977.83

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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.