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Finding the Fourth Proportional to 8,905.32, 12,290.28 and 5,128.64

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Solution

The fourth proportional to 8,905.32, 12,290.28 and 5,128.64 is: 7,078.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,905.32 : 12,290.28 = 5,128.64 : x
  2. Step 2: Convert to fraction form
    8,905.32/12,290.28 = 5,128.64/x
  3. Step 3: Cross multiply
    8,905.32x = 12,290.28 × 5,128.64
  4. Step 4: Simplify right side
    8,905.32x = 63,032,421.62
  5. Step 5: Solve for x
    x = 63,032,421.62/8,905.32
  6. Step 6: Final answer
    x = 7,078.06

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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.