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Finding the Fourth Proportional to 15,888.94, 21,929.36 and 8,817.64

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Solution

The fourth proportional to 15,888.94, 21,929.36 and 8,817.64 is: 12,169.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,888.94 : 21,929.36 = 8,817.64 : x
  2. Step 2: Convert to fraction form
    15,888.94/21,929.36 = 8,817.64/x
  3. Step 3: Cross multiply
    15,888.94x = 21,929.36 × 8,817.64
  4. Step 4: Simplify right side
    15,888.94x = 193,365,201.91
  5. Step 5: Solve for x
    x = 193,365,201.91/15,888.94
  6. Step 6: Final answer
    x = 12,169.80

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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.