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Finding the Fourth Proportional to 9,394.64, 12,961.65 and 5,415.20

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Solution

The fourth proportional to 9,394.64, 12,961.65 and 5,415.20 is: 7,471.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,394.64 : 12,961.65 = 5,415.20 : x
  2. Step 2: Convert to fraction form
    9,394.64/12,961.65 = 5,415.20/x
  3. Step 3: Cross multiply
    9,394.64x = 12,961.65 × 5,415.20
  4. Step 4: Simplify right side
    9,394.64x = 70,189,927.08
  5. Step 5: Solve for x
    x = 70,189,927.08/9,394.64
  6. Step 6: Final answer
    x = 7,471.27

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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.