Home / 13,130.69-18,120.15-7,162.31

Finding the Fourth Proportional to 13,130.69, 18,120.15 and 7,162.31

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Solution

The fourth proportional to 13,130.69, 18,120.15 and 7,162.31 is: 9,883.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,130.69 : 18,120.15 = 7,162.31 : x
  2. Step 2: Convert to fraction form
    13,130.69/18,120.15 = 7,162.31/x
  3. Step 3: Cross multiply
    13,130.69x = 18,120.15 × 7,162.31
  4. Step 4: Simplify right side
    13,130.69x = 129,782,040.95
  5. Step 5: Solve for x
    x = 129,782,040.95/13,130.69
  6. Step 6: Final answer
    x = 9,883.87

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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.