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Finding the Fourth Proportional to 6,389.52, 8,817.60 and 3,905.52

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Solution

The fourth proportional to 6,389.52, 8,817.60 and 3,905.52 is: 5,389.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,389.52 : 8,817.60 = 3,905.52 : x
  2. Step 2: Convert to fraction form
    6,389.52/8,817.60 = 3,905.52/x
  3. Step 3: Cross multiply
    6,389.52x = 8,817.60 × 3,905.52
  4. Step 4: Simplify right side
    6,389.52x = 34,437,313.15
  5. Step 5: Solve for x
    x = 34,437,313.15/6,389.52
  6. Step 6: Final answer
    x = 5,389.66

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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.