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Finding the Fourth Proportional to 12,935.80, 19,403.70 and 9,863.80

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Solution

The fourth proportional to 12,935.80, 19,403.70 and 9,863.80 is: 14,795.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,935.80 : 19,403.70 = 9,863.80 : x
  2. Step 2: Convert to fraction form
    12,935.80/19,403.70 = 9,863.80/x
  3. Step 3: Cross multiply
    12,935.80x = 19,403.70 × 9,863.80
  4. Step 4: Simplify right side
    12,935.80x = 191,394,216.06
  5. Step 5: Solve for x
    x = 191,394,216.06/12,935.80
  6. Step 6: Final answer
    x = 14,795.70

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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.