Home / 13,728.57-18,945.28-7,678.75

Finding the Fourth Proportional to 13,728.57, 18,945.28 and 7,678.75

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Solution

The fourth proportional to 13,728.57, 18,945.28 and 7,678.75 is: 10,596.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,728.57 : 18,945.28 = 7,678.75 : x
  2. Step 2: Convert to fraction form
    13,728.57/18,945.28 = 7,678.75/x
  3. Step 3: Cross multiply
    13,728.57x = 18,945.28 × 7,678.75
  4. Step 4: Simplify right side
    13,728.57x = 145,476,068.80
  5. Step 5: Solve for x
    x = 145,476,068.80/13,728.57
  6. Step 6: Final answer
    x = 10,596.59

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.