Home / 6,985.60-10,478.40-4,220.80

Finding the Fourth Proportional to 6,985.60, 10,478.40 and 4,220.80

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Solution

The fourth proportional to 6,985.60, 10,478.40 and 4,220.80 is: 6,331.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,985.60 : 10,478.40 = 4,220.80 : x
  2. Step 2: Convert to fraction form
    6,985.60/10,478.40 = 4,220.80/x
  3. Step 3: Cross multiply
    6,985.60x = 10,478.40 × 4,220.80
  4. Step 4: Simplify right side
    6,985.60x = 44,227,230.72
  5. Step 5: Solve for x
    x = 44,227,230.72/6,985.60
  6. Step 6: Final answer
    x = 6,331.20

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Similar ratio
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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.