Home / 12,911.40-19,368.90-5,515.80

Finding the Fourth Proportional to 12,911.40, 19,368.90 and 5,515.80

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Solution

The fourth proportional to 12,911.40, 19,368.90 and 5,515.80 is: 8,274.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,911.40 : 19,368.90 = 5,515.80 : x
  2. Step 2: Convert to fraction form
    12,911.40/19,368.90 = 5,515.80/x
  3. Step 3: Cross multiply
    12,911.40x = 19,368.90 × 5,515.80
  4. Step 4: Simplify right side
    12,911.40x = 106,834,978.62
  5. Step 5: Solve for x
    x = 106,834,978.62/12,911.40
  6. Step 6: Final answer
    x = 8,274.47

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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.