Home / 13,218.81-18,235.67-7,912.60

Finding the Fourth Proportional to 13,218.81, 18,235.67 and 7,912.60

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Solution

The fourth proportional to 13,218.81, 18,235.67 and 7,912.60 is: 10,915.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,218.81 : 18,235.67 = 7,912.60 : x
  2. Step 2: Convert to fraction form
    13,218.81/18,235.67 = 7,912.60/x
  3. Step 3: Cross multiply
    13,218.81x = 18,235.67 × 7,912.60
  4. Step 4: Simplify right side
    13,218.81x = 144,291,477.29
  5. Step 5: Solve for x
    x = 144,291,477.29/13,218.81
  6. Step 6: Final answer
    x = 10,915.62

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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.