Home / 13,219.51-18,237.91-8,439.64

Finding the Fourth Proportional to 13,219.51, 18,237.91 and 8,439.64

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Solution

The fourth proportional to 13,219.51, 18,237.91 and 8,439.64 is: 11,643.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,219.51 : 18,237.91 = 8,439.64 : x
  2. Step 2: Convert to fraction form
    13,219.51/18,237.91 = 8,439.64/x
  3. Step 3: Cross multiply
    13,219.51x = 18,237.91 × 8,439.64
  4. Step 4: Simplify right side
    13,219.51x = 153,921,394.75
  5. Step 5: Solve for x
    x = 153,921,394.75/13,219.51
  6. Step 6: Final answer
    x = 11,643.50

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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.