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Finding the Fourth Proportional to 1,419.58, 1,959.01 and 790.11

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Solution

The fourth proportional to 1,419.58, 1,959.01 and 790.11 is: 1,090.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,419.58 : 1,959.01 = 790.11 : x
  2. Step 2: Convert to fraction form
    1,419.58/1,959.01 = 790.11/x
  3. Step 3: Cross multiply
    1,419.58x = 1,959.01 × 790.11
  4. Step 4: Simplify right side
    1,419.58x = 1,547,833.39
  5. Step 5: Solve for x
    x = 1,547,833.39/1,419.58
  6. Step 6: Final answer
    x = 1,090.35

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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.