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Finding the Fourth Proportional to 15,870.54, 21,901 and 8,796.90

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Solution

The fourth proportional to 15,870.54, 21,901 and 8,796.90 is: 12,139.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,870.54 : 21,901 = 8,796.90 : x
  2. Step 2: Convert to fraction form
    15,870.54/21,901 = 8,796.90/x
  3. Step 3: Cross multiply
    15,870.54x = 21,901 × 8,796.90
  4. Step 4: Simplify right side
    15,870.54x = 192,660,906.90
  5. Step 5: Solve for x
    x = 192,660,906.90/15,870.54
  6. Step 6: Final answer
    x = 12,139.53

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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.