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Finding the Fourth Proportional to 19,279.96, 28,919.98 and 9,921.22

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Solution

The fourth proportional to 19,279.96, 28,919.98 and 9,921.22 is: 14,881.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,279.96 : 28,919.98 = 9,921.22 : x
  2. Step 2: Convert to fraction form
    19,279.96/28,919.98 = 9,921.22/x
  3. Step 3: Cross multiply
    19,279.96x = 28,919.98 × 9,921.22
  4. Step 4: Simplify right side
    19,279.96x = 286,921,483.98
  5. Step 5: Solve for x
    x = 286,921,483.98/19,279.96
  6. Step 6: Final answer
    x = 14,881.85

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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.