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Finding the Fourth Proportional to 1,321.90, 1,823.38 and 790.42

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Solution

The fourth proportional to 1,321.90, 1,823.38 and 790.42 is: 1,090.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.90 : 1,823.38 = 790.42 : x
  2. Step 2: Convert to fraction form
    1,321.90/1,823.38 = 790.42/x
  3. Step 3: Cross multiply
    1,321.90x = 1,823.38 × 790.42
  4. Step 4: Simplify right side
    1,321.90x = 1,441,236.02
  5. Step 5: Solve for x
    x = 1,441,236.02/1,321.90
  6. Step 6: Final answer
    x = 1,090.28

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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.