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Finding the Fourth Proportional to 9,370.64, 12,931.72 and 5,179.28

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Solution

The fourth proportional to 9,370.64, 12,931.72 and 5,179.28 is: 7,147.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,370.64 : 12,931.72 = 5,179.28 : x
  2. Step 2: Convert to fraction form
    9,370.64/12,931.72 = 5,179.28/x
  3. Step 3: Cross multiply
    9,370.64x = 12,931.72 × 5,179.28
  4. Step 4: Simplify right side
    9,370.64x = 66,976,998.76
  5. Step 5: Solve for x
    x = 66,976,998.76/9,370.64
  6. Step 6: Final answer
    x = 7,147.54

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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.