Home / 19,784.72-29,679.42-12,389.79

Finding the Fourth Proportional to 19,784.72, 29,679.42 and 12,389.79

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Solution

The fourth proportional to 19,784.72, 29,679.42 and 12,389.79 is: 18,586.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,784.72 : 29,679.42 = 12,389.79 : x
  2. Step 2: Convert to fraction form
    19,784.72/29,679.42 = 12,389.79/x
  3. Step 3: Cross multiply
    19,784.72x = 29,679.42 × 12,389.79
  4. Step 4: Simplify right side
    19,784.72x = 367,721,781.12
  5. Step 5: Solve for x
    x = 367,721,781.12/19,784.72
  6. Step 6: Final answer
    x = 18,586.16

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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.