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Finding the Fourth Proportional to 21,718.48, 29,971.56 and 11,782.48

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Solution

The fourth proportional to 21,718.48, 29,971.56 and 11,782.48 is: 16,259.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,718.48 : 29,971.56 = 11,782.48 : x
  2. Step 2: Convert to fraction form
    21,718.48/29,971.56 = 11,782.48/x
  3. Step 3: Cross multiply
    21,718.48x = 29,971.56 × 11,782.48
  4. Step 4: Simplify right side
    21,718.48x = 353,139,306.27
  5. Step 5: Solve for x
    x = 353,139,306.27/21,718.48
  6. Step 6: Final answer
    x = 16,259.85

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.