Home / 20,985.60-31,478.40-20,179.20

Finding the Fourth Proportional to 20,985.60, 31,478.40 and 20,179.20

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Solution

The fourth proportional to 20,985.60, 31,478.40 and 20,179.20 is: 30,268.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,985.60 : 31,478.40 = 20,179.20 : x
  2. Step 2: Convert to fraction form
    20,985.60/31,478.40 = 20,179.20/x
  3. Step 3: Cross multiply
    20,985.60x = 31,478.40 × 20,179.20
  4. Step 4: Simplify right side
    20,985.60x = 635,208,929.28
  5. Step 5: Solve for x
    x = 635,208,929.28/20,985.60
  6. Step 6: Final answer
    x = 30,268.80

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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.