Home / 1,386.30-2,080.65-1,112.70

Finding the Fourth Proportional to 1,386.30, 2,080.65 and 1,112.70

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Solution

The fourth proportional to 1,386.30, 2,080.65 and 1,112.70 is: 1,670.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.30 : 2,080.65 = 1,112.70 : x
  2. Step 2: Convert to fraction form
    1,386.30/2,080.65 = 1,112.70/x
  3. Step 3: Cross multiply
    1,386.30x = 2,080.65 × 1,112.70
  4. Step 4: Simplify right side
    1,386.30x = 2,315,139.26
  5. Step 5: Solve for x
    x = 2,315,139.26/1,386.30
  6. Step 6: Final answer
    x = 1,670.01

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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.