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Finding the Fourth Proportional to 15,870.78, 21,901.34 and 8,797.14

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Solution

The fourth proportional to 15,870.78, 21,901.34 and 8,797.14 is: 12,139.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,870.78 : 21,901.34 = 8,797.14 : x
  2. Step 2: Convert to fraction form
    15,870.78/21,901.34 = 8,797.14/x
  3. Step 3: Cross multiply
    15,870.78x = 21,901.34 × 8,797.14
  4. Step 4: Simplify right side
    15,870.78x = 192,669,154.17
  5. Step 5: Solve for x
    x = 192,669,154.17/15,870.78
  6. Step 6: Final answer
    x = 12,139.87

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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.