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Finding the Fourth Proportional to 8,421.78, 11,622.78 and 4,645.56

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Solution

The fourth proportional to 8,421.78, 11,622.78 and 4,645.56 is: 6,411.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,421.78 : 11,622.78 = 4,645.56 : x
  2. Step 2: Convert to fraction form
    8,421.78/11,622.78 = 4,645.56/x
  3. Step 3: Cross multiply
    8,421.78x = 11,622.78 × 4,645.56
  4. Step 4: Simplify right side
    8,421.78x = 53,994,321.86
  5. Step 5: Solve for x
    x = 53,994,321.86/8,421.78
  6. Step 6: Final answer
    x = 6,411.27

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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.