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Finding the Fourth Proportional to 68,880.20, 103,123.20 and 42,406.70

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Solution

The fourth proportional to 68,880.20, 103,123.20 and 42,406.70 is: 63,488.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,880.20 : 103,123.20 = 42,406.70 : x
  2. Step 2: Convert to fraction form
    68,880.20/103,123.20 = 42,406.70/x
  3. Step 3: Cross multiply
    68,880.20x = 103,123.20 × 42,406.70
  4. Step 4: Simplify right side
    68,880.20x = 4,373,114,605.44
  5. Step 5: Solve for x
    x = 4,373,114,605.44/68,880.20
  6. Step 6: Final answer
    x = 63,488.70

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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.