Home / 1,308.38-1,962.58-321.20

Finding the Fourth Proportional to 1,308.38, 1,962.58 and 321.20

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Solution

The fourth proportional to 1,308.38, 1,962.58 and 321.20 is: 481.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,308.38 : 1,962.58 = 321.20 : x
  2. Step 2: Convert to fraction form
    1,308.38/1,962.58 = 321.20/x
  3. Step 3: Cross multiply
    1,308.38x = 1,962.58 × 321.20
  4. Step 4: Simplify right side
    1,308.38x = 630,385.60
  5. Step 5: Solve for x
    x = 630,385.60/1,308.38
  6. Step 6: Final answer
    x = 481.80

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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.