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Finding the Fourth Proportional to 1,243.60, 1,860.60 and 811.60

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Solution

The fourth proportional to 1,243.60, 1,860.60 and 811.60 is: 1,214.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,243.60 : 1,860.60 = 811.60 : x
  2. Step 2: Convert to fraction form
    1,243.60/1,860.60 = 811.60/x
  3. Step 3: Cross multiply
    1,243.60x = 1,860.60 × 811.60
  4. Step 4: Simplify right side
    1,243.60x = 1,510,062.96
  5. Step 5: Solve for x
    x = 1,510,062.96/1,243.60
  6. Step 6: Final answer
    x = 1,214.27

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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.