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Finding the Fourth Proportional to 5,485.20, 7,664.70 and 5,485.20

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Solution

The fourth proportional to 5,485.20, 7,664.70 and 5,485.20 is: 7,664.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,485.20 : 7,664.70 = 5,485.20 : x
  2. Step 2: Convert to fraction form
    5,485.20/7,664.70 = 5,485.20/x
  3. Step 3: Cross multiply
    5,485.20x = 7,664.70 × 5,485.20
  4. Step 4: Simplify right side
    5,485.20x = 42,042,412.44
  5. Step 5: Solve for x
    x = 42,042,412.44/5,485.20
  6. Step 6: Final answer
    x = 7,664.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.