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Finding the Fourth Proportional to 15,638.91, 21,582.05 and 8,924.40

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Solution

The fourth proportional to 15,638.91, 21,582.05 and 8,924.40 is: 12,315.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,638.91 : 21,582.05 = 8,924.40 : x
  2. Step 2: Convert to fraction form
    15,638.91/21,582.05 = 8,924.40/x
  3. Step 3: Cross multiply
    15,638.91x = 21,582.05 × 8,924.40
  4. Step 4: Simplify right side
    15,638.91x = 192,606,863.10
  5. Step 5: Solve for x
    x = 192,606,863.10/15,638.91
  6. Step 6: Final answer
    x = 12,315.87

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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.