Home / 1,317.60-1,819.80-1,285.20

Finding the Fourth Proportional to 1,317.60, 1,819.80 and 1,285.20

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Solution

The fourth proportional to 1,317.60, 1,819.80 and 1,285.20 is: 1,775.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,317.60 : 1,819.80 = 1,285.20 : x
  2. Step 2: Convert to fraction form
    1,317.60/1,819.80 = 1,285.20/x
  3. Step 3: Cross multiply
    1,317.60x = 1,819.80 × 1,285.20
  4. Step 4: Simplify right side
    1,317.60x = 2,338,806.96
  5. Step 5: Solve for x
    x = 2,338,806.96/1,317.60
  6. Step 6: Final answer
    x = 1,775.05

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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.