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Finding the Fourth Proportional to 1,420.12, 1,959.62 and 790.55

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Solution

The fourth proportional to 1,420.12, 1,959.62 and 790.55 is: 1,090.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.12 : 1,959.62 = 790.55 : x
  2. Step 2: Convert to fraction form
    1,420.12/1,959.62 = 790.55/x
  3. Step 3: Cross multiply
    1,420.12x = 1,959.62 × 790.55
  4. Step 4: Simplify right side
    1,420.12x = 1,549,177.59
  5. Step 5: Solve for x
    x = 1,549,177.59/1,420.12
  6. Step 6: Final answer
    x = 1,090.88

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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.