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Finding the Fourth Proportional to 19,843.20, 29,739.60 and 9,985.20

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Solution

The fourth proportional to 19,843.20, 29,739.60 and 9,985.20 is: 14,965.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,843.20 : 29,739.60 = 9,985.20 : x
  2. Step 2: Convert to fraction form
    19,843.20/29,739.60 = 9,985.20/x
  3. Step 3: Cross multiply
    19,843.20x = 29,739.60 × 9,985.20
  4. Step 4: Simplify right side
    19,843.20x = 296,955,853.92
  5. Step 5: Solve for x
    x = 296,955,853.92/19,843.20
  6. Step 6: Final answer
    x = 14,965.12

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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.