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Finding the Fourth Proportional to 15,495.45, 21,383.88 and 8,421.87

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Solution

The fourth proportional to 15,495.45, 21,383.88 and 8,421.87 is: 11,622.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,495.45 : 21,383.88 = 8,421.87 : x
  2. Step 2: Convert to fraction form
    15,495.45/21,383.88 = 8,421.87/x
  3. Step 3: Cross multiply
    15,495.45x = 21,383.88 × 8,421.87
  4. Step 4: Simplify right side
    15,495.45x = 180,092,257.46
  5. Step 5: Solve for x
    x = 180,092,257.46/15,495.45
  6. Step 6: Final answer
    x = 11,622.27

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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.