Home / 5,320.40-7,980.60-1,857.20

Finding the Fourth Proportional to 5,320.40, 7,980.60 and 1,857.20

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Solution

The fourth proportional to 5,320.40, 7,980.60 and 1,857.20 is: 2,785.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,320.40 : 7,980.60 = 1,857.20 : x
  2. Step 2: Convert to fraction form
    5,320.40/7,980.60 = 1,857.20/x
  3. Step 3: Cross multiply
    5,320.40x = 7,980.60 × 1,857.20
  4. Step 4: Simplify right side
    5,320.40x = 14,821,570.32
  5. Step 5: Solve for x
    x = 14,821,570.32/5,320.40
  6. Step 6: Final answer
    x = 2,785.80

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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.