Home / 12,987.24-19,478.10-4,219.80

Finding the Fourth Proportional to 12,987.24, 19,478.10 and 4,219.80

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Solution

The fourth proportional to 12,987.24, 19,478.10 and 4,219.80 is: 6,328.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,987.24 : 19,478.10 = 4,219.80 : x
  2. Step 2: Convert to fraction form
    12,987.24/19,478.10 = 4,219.80/x
  3. Step 3: Cross multiply
    12,987.24x = 19,478.10 × 4,219.80
  4. Step 4: Simplify right side
    12,987.24x = 82,193,686.38
  5. Step 5: Solve for x
    x = 82,193,686.38/12,987.24
  6. Step 6: Final answer
    x = 6,328.80

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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.