Home / 20,987.20-31,480.80-13,201.60

Finding the Fourth Proportional to 20,987.20, 31,480.80 and 13,201.60

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Solution

The fourth proportional to 20,987.20, 31,480.80 and 13,201.60 is: 19,802.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,987.20 : 31,480.80 = 13,201.60 : x
  2. Step 2: Convert to fraction form
    20,987.20/31,480.80 = 13,201.60/x
  3. Step 3: Cross multiply
    20,987.20x = 31,480.80 × 13,201.60
  4. Step 4: Simplify right side
    20,987.20x = 415,596,929.28
  5. Step 5: Solve for x
    x = 415,596,929.28/20,987.20
  6. Step 6: Final answer
    x = 19,802.40

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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.