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Finding the Fourth Proportional to 1,419.92, 1,959.46 and 790.36

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Solution

The fourth proportional to 1,419.92, 1,959.46 and 790.36 is: 1,090.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,419.92 : 1,959.46 = 790.36 : x
  2. Step 2: Convert to fraction form
    1,419.92/1,959.46 = 790.36/x
  3. Step 3: Cross multiply
    1,419.92x = 1,959.46 × 790.36
  4. Step 4: Simplify right side
    1,419.92x = 1,548,678.81
  5. Step 5: Solve for x
    x = 1,548,678.81/1,419.92
  6. Step 6: Final answer
    x = 1,090.68

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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.