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Finding the Fourth Proportional to 19,865.70, 29,820.15 and 11,117.70

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Solution

The fourth proportional to 19,865.70, 29,820.15 and 11,117.70 is: 16,688.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,865.70 : 29,820.15 = 11,117.70 : x
  2. Step 2: Convert to fraction form
    19,865.70/29,820.15 = 11,117.70/x
  3. Step 3: Cross multiply
    19,865.70x = 29,820.15 × 11,117.70
  4. Step 4: Simplify right side
    19,865.70x = 331,531,481.66
  5. Step 5: Solve for x
    x = 331,531,481.66/19,865.70
  6. Step 6: Final answer
    x = 16,688.64

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1.5x scale

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.