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Finding the Fourth Proportional to 12,890.71, 17,790.65 and 7,226.98

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Solution

The fourth proportional to 12,890.71, 17,790.65 and 7,226.98 is: 9,974.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,890.71 : 17,790.65 = 7,226.98 : x
  2. Step 2: Convert to fraction form
    12,890.71/17,790.65 = 7,226.98/x
  3. Step 3: Cross multiply
    12,890.71x = 17,790.65 × 7,226.98
  4. Step 4: Simplify right side
    12,890.71x = 128,572,671.74
  5. Step 5: Solve for x
    x = 128,572,671.74/12,890.71
  6. Step 6: Final answer
    x = 9,974.06

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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.