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Finding the Fourth Proportional to 21,663.59, 29,883.92 and 15,684.89

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Solution

The fourth proportional to 21,663.59, 29,883.92 and 15,684.89 is: 21,636.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,663.59 : 29,883.92 = 15,684.89 : x
  2. Step 2: Convert to fraction form
    21,663.59/29,883.92 = 15,684.89/x
  3. Step 3: Cross multiply
    21,663.59x = 29,883.92 × 15,684.89
  4. Step 4: Simplify right side
    21,663.59x = 468,725,770.12
  5. Step 5: Solve for x
    x = 468,725,770.12/21,663.59
  6. Step 6: Final answer
    x = 21,636.57

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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.