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Finding the Fourth Proportional to 12,690.88, 19,040.87 and 5,670.30

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Solution

The fourth proportional to 12,690.88, 19,040.87 and 5,670.30 is: 8,507.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,690.88 : 19,040.87 = 5,670.30 : x
  2. Step 2: Convert to fraction form
    12,690.88/19,040.87 = 5,670.30/x
  3. Step 3: Cross multiply
    12,690.88x = 19,040.87 × 5,670.30
  4. Step 4: Simplify right side
    12,690.88x = 107,967,530.74
  5. Step 5: Solve for x
    x = 107,967,530.74/12,690.88
  6. Step 6: Final answer
    x = 8,507.49

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.