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Finding the Fourth Proportional to 15,855.83, 21,881.43 and 8,686.11

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Solution

The fourth proportional to 15,855.83, 21,881.43 and 8,686.11 is: 11,987.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,855.83 : 21,881.43 = 8,686.11 : x
  2. Step 2: Convert to fraction form
    15,855.83/21,881.43 = 8,686.11/x
  3. Step 3: Cross multiply
    15,855.83x = 21,881.43 × 8,686.11
  4. Step 4: Simplify right side
    15,855.83x = 190,064,507.94
  5. Step 5: Solve for x
    x = 190,064,507.94/15,855.83
  6. Step 6: Final answer
    x = 11,987.05

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.