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Finding the Fourth Proportional to 19,861, 29,791.52 and 8,460

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Solution

The fourth proportional to 19,861, 29,791.52 and 8,460 is: 12,690.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,861 : 29,791.52 = 8,460 : x
  2. Step 2: Convert to fraction form
    19,861/29,791.52 = 8,460/x
  3. Step 3: Cross multiply
    19,861x = 29,791.52 × 8,460
  4. Step 4: Simplify right side
    19,861x = 252,036,259.20
  5. Step 5: Solve for x
    x = 252,036,259.20/19,861
  6. Step 6: Final answer
    x = 12,690.01

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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.