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Finding the Fourth Proportional to 15,503.69, 21,394.64 and 8,789.93

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Solution

The fourth proportional to 15,503.69, 21,394.64 and 8,789.93 is: 12,129.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,503.69 : 21,394.64 = 8,789.93 : x
  2. Step 2: Convert to fraction form
    15,503.69/21,394.64 = 8,789.93/x
  3. Step 3: Cross multiply
    15,503.69x = 21,394.64 × 8,789.93
  4. Step 4: Simplify right side
    15,503.69x = 188,057,344.03
  5. Step 5: Solve for x
    x = 188,057,344.03/15,503.69
  6. Step 6: Final answer
    x = 12,129.84

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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.