Home / 31,427.20-47,140.80-12,959.20

Finding the Fourth Proportional to 31,427.20, 47,140.80 and 12,959.20

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Solution

The fourth proportional to 31,427.20, 47,140.80 and 12,959.20 is: 19,438.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,427.20 : 47,140.80 = 12,959.20 : x
  2. Step 2: Convert to fraction form
    31,427.20/47,140.80 = 12,959.20/x
  3. Step 3: Cross multiply
    31,427.20x = 47,140.80 × 12,959.20
  4. Step 4: Simplify right side
    31,427.20x = 610,907,055.36
  5. Step 5: Solve for x
    x = 610,907,055.36/31,427.20
  6. Step 6: Final answer
    x = 19,438.80

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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.