Home / 31,147.20-46,720.80-12,679.20

Finding the Fourth Proportional to 31,147.20, 46,720.80 and 12,679.20

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Solution

The fourth proportional to 31,147.20, 46,720.80 and 12,679.20 is: 19,018.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,147.20 : 46,720.80 = 12,679.20 : x
  2. Step 2: Convert to fraction form
    31,147.20/46,720.80 = 12,679.20/x
  3. Step 3: Cross multiply
    31,147.20x = 46,720.80 × 12,679.20
  4. Step 4: Simplify right side
    31,147.20x = 592,382,367.36
  5. Step 5: Solve for x
    x = 592,382,367.36/31,147.20
  6. Step 6: Final answer
    x = 19,018.80

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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.