Home / 1,390.12-2,080.55-1,159.47

Finding the Fourth Proportional to 1,390.12, 2,080.55 and 1,159.47

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Solution

The fourth proportional to 1,390.12, 2,080.55 and 1,159.47 is: 1,735.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.12 : 2,080.55 = 1,159.47 : x
  2. Step 2: Convert to fraction form
    1,390.12/2,080.55 = 1,159.47/x
  3. Step 3: Cross multiply
    1,390.12x = 2,080.55 × 1,159.47
  4. Step 4: Simplify right side
    1,390.12x = 2,412,338.21
  5. Step 5: Solve for x
    x = 2,412,338.21/1,390.12
  6. Step 6: Final answer
    x = 1,735.35

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.