Home / 1,319.18-1,819.80-1,225.38

Finding the Fourth Proportional to 1,319.18, 1,819.80 and 1,225.38

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Solution

The fourth proportional to 1,319.18, 1,819.80 and 1,225.38 is: 1,690.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.18 : 1,819.80 = 1,225.38 : x
  2. Step 2: Convert to fraction form
    1,319.18/1,819.80 = 1,225.38/x
  3. Step 3: Cross multiply
    1,319.18x = 1,819.80 × 1,225.38
  4. Step 4: Simplify right side
    1,319.18x = 2,229,946.52
  5. Step 5: Solve for x
    x = 2,229,946.52/1,319.18
  6. Step 6: Final answer
    x = 1,690.40

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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.