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Finding the Fourth Proportional to 68,586.10, 102,879.15 and 42,205.30

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Solution

The fourth proportional to 68,586.10, 102,879.15 and 42,205.30 is: 63,307.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,586.10 : 102,879.15 = 42,205.30 : x
  2. Step 2: Convert to fraction form
    68,586.10/102,879.15 = 42,205.30/x
  3. Step 3: Cross multiply
    68,586.10x = 102,879.15 × 42,205.30
  4. Step 4: Simplify right side
    68,586.10x = 4,342,045,389.50
  5. Step 5: Solve for x
    x = 4,342,045,389.50/68,586.10
  6. Step 6: Final answer
    x = 63,307.95

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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.