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Finding the Fourth Proportional to 19,218.88, 28,776.40 and 9,965.44

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Solution

The fourth proportional to 19,218.88, 28,776.40 and 9,965.44 is: 14,921.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,218.88 : 28,776.40 = 9,965.44 : x
  2. Step 2: Convert to fraction form
    19,218.88/28,776.40 = 9,965.44/x
  3. Step 3: Cross multiply
    19,218.88x = 28,776.40 × 9,965.44
  4. Step 4: Simplify right side
    19,218.88x = 286,769,487.62
  5. Step 5: Solve for x
    x = 286,769,487.62/19,218.88
  6. Step 6: Final answer
    x = 14,921.24

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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.