Home / 12,939.60-19,412.10-7,388.40

Finding the Fourth Proportional to 12,939.60, 19,412.10 and 7,388.40

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Solution

The fourth proportional to 12,939.60, 19,412.10 and 7,388.40 is: 11,084.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,939.60 : 19,412.10 = 7,388.40 : x
  2. Step 2: Convert to fraction form
    12,939.60/19,412.10 = 7,388.40/x
  3. Step 3: Cross multiply
    12,939.60x = 19,412.10 × 7,388.40
  4. Step 4: Simplify right side
    12,939.60x = 143,424,359.64
  5. Step 5: Solve for x
    x = 143,424,359.64/12,939.60
  6. Step 6: Final answer
    x = 11,084.14

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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.