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Finding the Fourth Proportional to 12,986.40, 19,479.60 and 12,813.60

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Solution

The fourth proportional to 12,986.40, 19,479.60 and 12,813.60 is: 19,220.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,986.40 : 19,479.60 = 12,813.60 : x
  2. Step 2: Convert to fraction form
    12,986.40/19,479.60 = 12,813.60/x
  3. Step 3: Cross multiply
    12,986.40x = 19,479.60 × 12,813.60
  4. Step 4: Simplify right side
    12,986.40x = 249,603,802.56
  5. Step 5: Solve for x
    x = 249,603,802.56/12,986.40
  6. Step 6: Final answer
    x = 19,220.40

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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.