Home / 12,945.40-19,418.10-12,830.20

Finding the Fourth Proportional to 12,945.40, 19,418.10 and 12,830.20

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Solution

The fourth proportional to 12,945.40, 19,418.10 and 12,830.20 is: 19,245.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,945.40 : 19,418.10 = 12,830.20 : x
  2. Step 2: Convert to fraction form
    12,945.40/19,418.10 = 12,830.20/x
  3. Step 3: Cross multiply
    12,945.40x = 19,418.10 × 12,830.20
  4. Step 4: Simplify right side
    12,945.40x = 249,138,106.62
  5. Step 5: Solve for x
    x = 249,138,106.62/12,945.40
  6. Step 6: Final answer
    x = 19,245.30

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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.