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Finding the Fourth Proportional to 12,686.80, 19,030.20 and 8,993.20

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Solution

The fourth proportional to 12,686.80, 19,030.20 and 8,993.20 is: 13,489.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,686.80 : 19,030.20 = 8,993.20 : x
  2. Step 2: Convert to fraction form
    12,686.80/19,030.20 = 8,993.20/x
  3. Step 3: Cross multiply
    12,686.80x = 19,030.20 × 8,993.20
  4. Step 4: Simplify right side
    12,686.80x = 171,142,394.64
  5. Step 5: Solve for x
    x = 171,142,394.64/12,686.80
  6. Step 6: Final answer
    x = 13,489.80

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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.