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Finding the Fourth Proportional to 85,925.85, 128,872.08 and 43,219.89

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Solution

The fourth proportional to 85,925.85, 128,872.08 and 43,219.89 is: 64,821.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,925.85 : 128,872.08 = 43,219.89 : x
  2. Step 2: Convert to fraction form
    85,925.85/128,872.08 = 43,219.89/x
  3. Step 3: Cross multiply
    85,925.85x = 128,872.08 × 43,219.89
  4. Step 4: Simplify right side
    85,925.85x = 5,569,837,121.67
  5. Step 5: Solve for x
    x = 5,569,837,121.67/85,925.85
  6. Step 6: Final answer
    x = 64,821.44

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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.