Home / 5,412.80-8,135.40-5,315.60

Finding the Fourth Proportional to 5,412.80, 8,135.40 and 5,315.60

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Solution

The fourth proportional to 5,412.80, 8,135.40 and 5,315.60 is: 7,989.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,412.80 : 8,135.40 = 5,315.60 : x
  2. Step 2: Convert to fraction form
    5,412.80/8,135.40 = 5,315.60/x
  3. Step 3: Cross multiply
    5,412.80x = 8,135.40 × 5,315.60
  4. Step 4: Simplify right side
    5,412.80x = 43,244,532.24
  5. Step 5: Solve for x
    x = 43,244,532.24/5,412.80
  6. Step 6: Final answer
    x = 7,989.31

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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.