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Finding the Fourth Proportional to 6,485.40, 8,942.76 and 4,385.88

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Solution

The fourth proportional to 6,485.40, 8,942.76 and 4,385.88 is: 6,047.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,485.40 : 8,942.76 = 4,385.88 : x
  2. Step 2: Convert to fraction form
    6,485.40/8,942.76 = 4,385.88/x
  3. Step 3: Cross multiply
    6,485.40x = 8,942.76 × 4,385.88
  4. Step 4: Simplify right side
    6,485.40x = 39,221,872.23
  5. Step 5: Solve for x
    x = 39,221,872.23/6,485.40
  6. Step 6: Final answer
    x = 6,047.72

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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.