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Finding the Fourth Proportional to 1,420.11, 1,959.59 and 790.49

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Solution

The fourth proportional to 1,420.11, 1,959.59 and 790.49 is: 1,090.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.11 : 1,959.59 = 790.49 : x
  2. Step 2: Convert to fraction form
    1,420.11/1,959.59 = 790.49/x
  3. Step 3: Cross multiply
    1,420.11x = 1,959.59 × 790.49
  4. Step 4: Simplify right side
    1,420.11x = 1,549,022.55
  5. Step 5: Solve for x
    x = 1,549,022.55/1,420.11
  6. Step 6: Final answer
    x = 1,090.78

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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.