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Finding the Fourth Proportional to 19,919.40, 29,879.10 and 16,663.20

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Solution

The fourth proportional to 19,919.40, 29,879.10 and 16,663.20 is: 24,994.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,919.40 : 29,879.10 = 16,663.20 : x
  2. Step 2: Convert to fraction form
    19,919.40/29,879.10 = 16,663.20/x
  3. Step 3: Cross multiply
    19,919.40x = 29,879.10 × 16,663.20
  4. Step 4: Simplify right side
    19,919.40x = 497,881,419.12
  5. Step 5: Solve for x
    x = 497,881,419.12/19,919.40
  6. Step 6: Final answer
    x = 24,994.80

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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.