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Finding the Fourth Proportional to 5,670.40, 8,505.60 and 3,920.80

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Solution

The fourth proportional to 5,670.40, 8,505.60 and 3,920.80 is: 5,881.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,670.40 : 8,505.60 = 3,920.80 : x
  2. Step 2: Convert to fraction form
    5,670.40/8,505.60 = 3,920.80/x
  3. Step 3: Cross multiply
    5,670.40x = 8,505.60 × 3,920.80
  4. Step 4: Simplify right side
    5,670.40x = 33,348,756.48
  5. Step 5: Solve for x
    x = 33,348,756.48/5,670.40
  6. Step 6: Final answer
    x = 5,881.20

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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.