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Finding the Fourth Proportional to 12,986.80, 19,499.40 and 10,068.40

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Solution

The fourth proportional to 12,986.80, 19,499.40 and 10,068.40 is: 15,117.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,986.80 : 19,499.40 = 10,068.40 : x
  2. Step 2: Convert to fraction form
    12,986.80/19,499.40 = 10,068.40/x
  3. Step 3: Cross multiply
    12,986.80x = 19,499.40 × 10,068.40
  4. Step 4: Simplify right side
    12,986.80x = 196,327,758.96
  5. Step 5: Solve for x
    x = 196,327,758.96/12,986.80
  6. Step 6: Final answer
    x = 15,117.49

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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.