Home / 12,890.40-19,321.20-7,346.40

Finding the Fourth Proportional to 12,890.40, 19,321.20 and 7,346.40

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Solution

The fourth proportional to 12,890.40, 19,321.20 and 7,346.40 is: 11,011.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,890.40 : 19,321.20 = 7,346.40 : x
  2. Step 2: Convert to fraction form
    12,890.40/19,321.20 = 7,346.40/x
  3. Step 3: Cross multiply
    12,890.40x = 19,321.20 × 7,346.40
  4. Step 4: Simplify right side
    12,890.40x = 141,941,263.68
  5. Step 5: Solve for x
    x = 141,941,263.68/12,890.40
  6. Step 6: Final answer
    x = 11,011.39

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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.