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Finding the Fourth Proportional to 19,991.90, 29,987.94 and 8,305.13

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Solution

The fourth proportional to 19,991.90, 29,987.94 and 8,305.13 is: 12,457.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,991.90 : 29,987.94 = 8,305.13 : x
  2. Step 2: Convert to fraction form
    19,991.90/29,987.94 = 8,305.13/x
  3. Step 3: Cross multiply
    19,991.90x = 29,987.94 × 8,305.13
  4. Step 4: Simplify right side
    19,991.90x = 249,053,590.19
  5. Step 5: Solve for x
    x = 249,053,590.19/19,991.90
  6. Step 6: Final answer
    x = 12,457.73

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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.