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Finding the Fourth Proportional to 9,390.72, 12,942.26 and 8,315.58

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Solution

The fourth proportional to 9,390.72, 12,942.26 and 8,315.58 is: 11,460.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,390.72 : 12,942.26 = 8,315.58 : x
  2. Step 2: Convert to fraction form
    9,390.72/12,942.26 = 8,315.58/x
  3. Step 3: Cross multiply
    9,390.72x = 12,942.26 × 8,315.58
  4. Step 4: Simplify right side
    9,390.72x = 107,622,398.41
  5. Step 5: Solve for x
    x = 107,622,398.41/9,390.72
  6. Step 6: Final answer
    x = 11,460.51

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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.