Home / 5,785.20-7,980.60-4,210.80

Finding the Fourth Proportional to 5,785.20, 7,980.60 and 4,210.80

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Solution

The fourth proportional to 5,785.20, 7,980.60 and 4,210.80 is: 5,808.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,785.20 : 7,980.60 = 4,210.80 : x
  2. Step 2: Convert to fraction form
    5,785.20/7,980.60 = 4,210.80/x
  3. Step 3: Cross multiply
    5,785.20x = 7,980.60 × 4,210.80
  4. Step 4: Simplify right side
    5,785.20x = 33,604,710.48
  5. Step 5: Solve for x
    x = 33,604,710.48/5,785.20
  6. Step 6: Final answer
    x = 5,808.74

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.