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Finding the Fourth Proportional to 15,858.68, 21,885.15 and 8,785.52

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Solution

The fourth proportional to 15,858.68, 21,885.15 and 8,785.52 is: 12,124.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,858.68 : 21,885.15 = 8,785.52 : x
  2. Step 2: Convert to fraction form
    15,858.68/21,885.15 = 8,785.52/x
  3. Step 3: Cross multiply
    15,858.68x = 21,885.15 × 8,785.52
  4. Step 4: Simplify right side
    15,858.68x = 192,272,423.03
  5. Step 5: Solve for x
    x = 192,272,423.03/15,858.68
  6. Step 6: Final answer
    x = 12,124.11

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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.