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Finding the Fourth Proportional to 42,455.90, 63,683.62 and 10,865.90

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Solution

The fourth proportional to 42,455.90, 63,683.62 and 10,865.90 is: 16,298.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,455.90 : 63,683.62 = 10,865.90 : x
  2. Step 2: Convert to fraction form
    42,455.90/63,683.62 = 10,865.90/x
  3. Step 3: Cross multiply
    42,455.90x = 63,683.62 × 10,865.90
  4. Step 4: Simplify right side
    42,455.90x = 691,979,620.38
  5. Step 5: Solve for x
    x = 691,979,620.38/42,455.90
  6. Step 6: Final answer
    x = 16,298.79

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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.