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Finding the Fourth Proportional to 19,911.60, 29,818.80 and 9,511.20

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Solution

The fourth proportional to 19,911.60, 29,818.80 and 9,511.20 is: 14,243.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,911.60 : 29,818.80 = 9,511.20 : x
  2. Step 2: Convert to fraction form
    19,911.60/29,818.80 = 9,511.20/x
  3. Step 3: Cross multiply
    19,911.60x = 29,818.80 × 9,511.20
  4. Step 4: Simplify right side
    19,911.60x = 283,612,570.56
  5. Step 5: Solve for x
    x = 283,612,570.56/19,911.60
  6. Step 6: Final answer
    x = 14,243.59

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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.