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Finding the Fourth Proportional to 15,858.80, 21,884.32 and 8,784.80

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Solution

The fourth proportional to 15,858.80, 21,884.32 and 8,784.80 is: 12,122.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,858.80 : 21,884.32 = 8,784.80 : x
  2. Step 2: Convert to fraction form
    15,858.80/21,884.32 = 8,784.80/x
  3. Step 3: Cross multiply
    15,858.80x = 21,884.32 × 8,784.80
  4. Step 4: Simplify right side
    15,858.80x = 192,249,374.34
  5. Step 5: Solve for x
    x = 192,249,374.34/15,858.80
  6. Step 6: Final answer
    x = 12,122.57

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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.