Home / 12,919.80-19,368.18-5,123.28

Finding the Fourth Proportional to 12,919.80, 19,368.18 and 5,123.28

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Solution

The fourth proportional to 12,919.80, 19,368.18 and 5,123.28 is: 7,680.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,919.80 : 19,368.18 = 5,123.28 : x
  2. Step 2: Convert to fraction form
    12,919.80/19,368.18 = 5,123.28/x
  3. Step 3: Cross multiply
    12,919.80x = 19,368.18 × 5,123.28
  4. Step 4: Simplify right side
    12,919.80x = 99,228,609.23
  5. Step 5: Solve for x
    x = 99,228,609.23/12,919.80
  6. Step 6: Final answer
    x = 7,680.35

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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.