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Finding the Fourth Proportional to 7,471.28, 11,144.62 and 7,215.32

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Solution

The fourth proportional to 7,471.28, 11,144.62 and 7,215.32 is: 10,762.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,471.28 : 11,144.62 = 7,215.32 : x
  2. Step 2: Convert to fraction form
    7,471.28/11,144.62 = 7,215.32/x
  3. Step 3: Cross multiply
    7,471.28x = 11,144.62 × 7,215.32
  4. Step 4: Simplify right side
    7,471.28x = 80,411,999.58
  5. Step 5: Solve for x
    x = 80,411,999.58/7,471.28
  6. Step 6: Final answer
    x = 10,762.81

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.