Home / 18,918.36-28,366.56-6,431.40

Finding the Fourth Proportional to 18,918.36, 28,366.56 and 6,431.40

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Solution

The fourth proportional to 18,918.36, 28,366.56 and 6,431.40 is: 9,643.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,918.36 : 28,366.56 = 6,431.40 : x
  2. Step 2: Convert to fraction form
    18,918.36/28,366.56 = 6,431.40/x
  3. Step 3: Cross multiply
    18,918.36x = 28,366.56 × 6,431.40
  4. Step 4: Simplify right side
    18,918.36x = 182,436,693.98
  5. Step 5: Solve for x
    x = 182,436,693.98/18,918.36
  6. Step 6: Final answer
    x = 9,643.37

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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.