Home / 12,638.61-18,959.81-4,087.20

Finding the Fourth Proportional to 12,638.61, 18,959.81 and 4,087.20

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Solution

The fourth proportional to 12,638.61, 18,959.81 and 4,087.20 is: 6,131.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,638.61 : 18,959.81 = 4,087.20 : x
  2. Step 2: Convert to fraction form
    12,638.61/18,959.81 = 4,087.20/x
  3. Step 3: Cross multiply
    12,638.61x = 18,959.81 × 4,087.20
  4. Step 4: Simplify right side
    12,638.61x = 77,492,515.00
  5. Step 5: Solve for x
    x = 77,492,515.00/12,638.61
  6. Step 6: Final answer
    x = 6,131.41

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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.