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Finding the Fourth Proportional to 11,157.54, 15,398.62 and 7,128.08

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Solution

The fourth proportional to 11,157.54, 15,398.62 and 7,128.08 is: 9,837.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,157.54 : 15,398.62 = 7,128.08 : x
  2. Step 2: Convert to fraction form
    11,157.54/15,398.62 = 7,128.08/x
  3. Step 3: Cross multiply
    11,157.54x = 15,398.62 × 7,128.08
  4. Step 4: Simplify right side
    11,157.54x = 109,762,500.44
  5. Step 5: Solve for x
    x = 109,762,500.44/11,157.54
  6. Step 6: Final answer
    x = 9,837.52

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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.