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Finding the Fourth Proportional to 15,870.78, 21,901.50 and 8,797.16

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Solution

The fourth proportional to 15,870.78, 21,901.50 and 8,797.16 is: 12,139.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,870.78 : 21,901.50 = 8,797.16 : x
  2. Step 2: Convert to fraction form
    15,870.78/21,901.50 = 8,797.16/x
  3. Step 3: Cross multiply
    15,870.78x = 21,901.50 × 8,797.16
  4. Step 4: Simplify right side
    15,870.78x = 192,670,890.23
  5. Step 5: Solve for x
    x = 192,670,890.23/15,870.78
  6. Step 6: Final answer
    x = 12,139.98

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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.