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Finding the Fourth Proportional to 19,987.76, 27,699.77 and 19,705.88

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Solution

The fourth proportional to 19,987.76, 27,699.77 and 19,705.88 is: 27,309.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,987.76 : 27,699.77 = 19,705.88 : x
  2. Step 2: Convert to fraction form
    19,987.76/27,699.77 = 19,705.88/x
  3. Step 3: Cross multiply
    19,987.76x = 27,699.77 × 19,705.88
  4. Step 4: Simplify right side
    19,987.76x = 545,848,106.62
  5. Step 5: Solve for x
    x = 545,848,106.62/19,987.76
  6. Step 6: Final answer
    x = 27,309.13

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.