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Finding the Fourth Proportional to 12,890.80, 19,314.60 and 6,302.80

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Solution

The fourth proportional to 12,890.80, 19,314.60 and 6,302.80 is: 9,443.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,890.80 : 19,314.60 = 6,302.80 : x
  2. Step 2: Convert to fraction form
    12,890.80/19,314.60 = 6,302.80/x
  3. Step 3: Cross multiply
    12,890.80x = 19,314.60 × 6,302.80
  4. Step 4: Simplify right side
    12,890.80x = 121,736,060.88
  5. Step 5: Solve for x
    x = 121,736,060.88/12,890.80
  6. Step 6: Final answer
    x = 9,443.64

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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.