Home / 6,420.63-8,859.56-3,587.78

Finding the Fourth Proportional to 6,420.63, 8,859.56 and 3,587.78

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Solution

The fourth proportional to 6,420.63, 8,859.56 and 3,587.78 is: 4,950.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,420.63 : 8,859.56 = 3,587.78 : x
  2. Step 2: Convert to fraction form
    6,420.63/8,859.56 = 3,587.78/x
  3. Step 3: Cross multiply
    6,420.63x = 8,859.56 × 3,587.78
  4. Step 4: Simplify right side
    6,420.63x = 31,786,183.30
  5. Step 5: Solve for x
    x = 31,786,183.30/6,420.63
  6. Step 6: Final answer
    x = 4,950.63

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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.