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Finding the Fourth Proportional to 1,419.93, 1,959.64 and 790.46

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Solution

The fourth proportional to 1,419.93, 1,959.64 and 790.46 is: 1,090.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,419.93 : 1,959.64 = 790.46 : x
  2. Step 2: Convert to fraction form
    1,419.93/1,959.64 = 790.46/x
  3. Step 3: Cross multiply
    1,419.93x = 1,959.64 × 790.46
  4. Step 4: Simplify right side
    1,419.93x = 1,549,007.24
  5. Step 5: Solve for x
    x = 1,549,007.24/1,419.93
  6. Step 6: Final answer
    x = 1,090.91

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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.