Home / 20,805.60-31,208.40-20,416.80

Finding the Fourth Proportional to 20,805.60, 31,208.40 and 20,416.80

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Solution

The fourth proportional to 20,805.60, 31,208.40 and 20,416.80 is: 30,625.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,805.60 : 31,208.40 = 20,416.80 : x
  2. Step 2: Convert to fraction form
    20,805.60/31,208.40 = 20,416.80/x
  3. Step 3: Cross multiply
    20,805.60x = 31,208.40 × 20,416.80
  4. Step 4: Simplify right side
    20,805.60x = 637,175,661.12
  5. Step 5: Solve for x
    x = 637,175,661.12/20,805.60
  6. Step 6: Final answer
    x = 30,625.20

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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.