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Finding the Fourth Proportional to 1,419.71, 1,959.11 and 790.21

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Solution

The fourth proportional to 1,419.71, 1,959.11 and 790.21 is: 1,090.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,419.71 : 1,959.11 = 790.21 : x
  2. Step 2: Convert to fraction form
    1,419.71/1,959.11 = 790.21/x
  3. Step 3: Cross multiply
    1,419.71x = 1,959.11 × 790.21
  4. Step 4: Simplify right side
    1,419.71x = 1,548,105.39
  5. Step 5: Solve for x
    x = 1,548,105.39/1,419.71
  6. Step 6: Final answer
    x = 1,090.44

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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.