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Finding the Fourth Proportional to 15,862.64, 21,890.36 and 8,788.92

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Solution

The fourth proportional to 15,862.64, 21,890.36 and 8,788.92 is: 12,128.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,862.64 : 21,890.36 = 8,788.92 : x
  2. Step 2: Convert to fraction form
    15,862.64/21,890.36 = 8,788.92/x
  3. Step 3: Cross multiply
    15,862.64x = 21,890.36 × 8,788.92
  4. Step 4: Simplify right side
    15,862.64x = 192,392,622.81
  5. Step 5: Solve for x
    x = 192,392,622.81/15,862.64
  6. Step 6: Final answer
    x = 12,128.66

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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.