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Finding the Fourth Proportional to 15,495.53, 21,383.86 and 8,421.93

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Solution

The fourth proportional to 15,495.53, 21,383.86 and 8,421.93 is: 11,622.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,495.53 : 21,383.86 = 8,421.93 : x
  2. Step 2: Convert to fraction form
    15,495.53/21,383.86 = 8,421.93/x
  3. Step 3: Cross multiply
    15,495.53x = 21,383.86 × 8,421.93
  4. Step 4: Simplify right side
    15,495.53x = 180,093,446.98
  5. Step 5: Solve for x
    x = 180,093,446.98/15,495.53
  6. Step 6: Final answer
    x = 11,622.28

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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.