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Finding the Fourth Proportional to 6,391.50, 8,820.25 and 3,558.91

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Solution

The fourth proportional to 6,391.50, 8,820.25 and 3,558.91 is: 4,911.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,391.50 : 8,820.25 = 3,558.91 : x
  2. Step 2: Convert to fraction form
    6,391.50/8,820.25 = 3,558.91/x
  3. Step 3: Cross multiply
    6,391.50x = 8,820.25 × 3,558.91
  4. Step 4: Simplify right side
    6,391.50x = 31,390,421.75
  5. Step 5: Solve for x
    x = 31,390,421.75/6,391.50
  6. Step 6: Final answer
    x = 4,911.28

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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.