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Finding the Fourth Proportional to 12,690.88, 19,036.32 and 7,412.96

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Solution

The fourth proportional to 12,690.88, 19,036.32 and 7,412.96 is: 11,119.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,690.88 : 19,036.32 = 7,412.96 : x
  2. Step 2: Convert to fraction form
    12,690.88/19,036.32 = 7,412.96/x
  3. Step 3: Cross multiply
    12,690.88x = 19,036.32 × 7,412.96
  4. Step 4: Simplify right side
    12,690.88x = 141,115,478.71
  5. Step 5: Solve for x
    x = 141,115,478.71/12,690.88
  6. Step 6: Final answer
    x = 11,119.44

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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.