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Finding the Fourth Proportional to 12,776.32, 17,619.52 and 7,990.08

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Solution

The fourth proportional to 12,776.32, 17,619.52 and 7,990.08 is: 11,018.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,776.32 : 17,619.52 = 7,990.08 : x
  2. Step 2: Convert to fraction form
    12,776.32/17,619.52 = 7,990.08/x
  3. Step 3: Cross multiply
    12,776.32x = 17,619.52 × 7,990.08
  4. Step 4: Simplify right side
    12,776.32x = 140,781,374.36
  5. Step 5: Solve for x
    x = 140,781,374.36/12,776.32
  6. Step 6: Final answer
    x = 11,018.93

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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.