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Finding the Fourth Proportional to 15,871.22, 21,901.10 and 8,699.99

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Solution

The fourth proportional to 15,871.22, 21,901.10 and 8,699.99 is: 12,005.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,871.22 : 21,901.10 = 8,699.99 : x
  2. Step 2: Convert to fraction form
    15,871.22/21,901.10 = 8,699.99/x
  3. Step 3: Cross multiply
    15,871.22x = 21,901.10 × 8,699.99
  4. Step 4: Simplify right side
    15,871.22x = 190,539,427.49
  5. Step 5: Solve for x
    x = 190,539,427.49/15,871.22
  6. Step 6: Final answer
    x = 12,005.34

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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.