Home / 6,420.20-8,859.87-3,587.72

Finding the Fourth Proportional to 6,420.20, 8,859.87 and 3,587.72

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Solution

The fourth proportional to 6,420.20, 8,859.87 and 3,587.72 is: 4,951.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,420.20 : 8,859.87 = 3,587.72 : x
  2. Step 2: Convert to fraction form
    6,420.20/8,859.87 = 3,587.72/x
  3. Step 3: Cross multiply
    6,420.20x = 8,859.87 × 3,587.72
  4. Step 4: Simplify right side
    6,420.20x = 31,786,688.50
  5. Step 5: Solve for x
    x = 31,786,688.50/6,420.20
  6. Step 6: Final answer
    x = 4,951.05

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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.