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Finding the Fourth Proportional to 85,926.60, 128,825.10 and 56,351.88

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Solution

The fourth proportional to 85,926.60, 128,825.10 and 56,351.88 is: 84,485.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,926.60 : 128,825.10 = 56,351.88 : x
  2. Step 2: Convert to fraction form
    85,926.60/128,825.10 = 56,351.88/x
  3. Step 3: Cross multiply
    85,926.60x = 128,825.10 × 56,351.88
  4. Step 4: Simplify right side
    85,926.60x = 7,259,536,576.19
  5. Step 5: Solve for x
    x = 7,259,536,576.19/85,926.60
  6. Step 6: Final answer
    x = 84,485.32

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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.