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Finding the Fourth Proportional to 6,977.76, 9,615 and 6,485.55

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Solution

The fourth proportional to 6,977.76, 9,615 and 6,485.55 is: 8,936.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,977.76 : 9,615 = 6,485.55 : x
  2. Step 2: Convert to fraction form
    6,977.76/9,615 = 6,485.55/x
  3. Step 3: Cross multiply
    6,977.76x = 9,615 × 6,485.55
  4. Step 4: Simplify right side
    6,977.76x = 62,358,563.25
  5. Step 5: Solve for x
    x = 62,358,563.25/6,977.76
  6. Step 6: Final answer
    x = 8,936.76

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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.