Home / 1,407.36-2,109.69-1,287.06

Finding the Fourth Proportional to 1,407.36, 2,109.69 and 1,287.06

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Solution

The fourth proportional to 1,407.36, 2,109.69 and 1,287.06 is: 1,929.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,407.36 : 2,109.69 = 1,287.06 : x
  2. Step 2: Convert to fraction form
    1,407.36/2,109.69 = 1,287.06/x
  3. Step 3: Cross multiply
    1,407.36x = 2,109.69 × 1,287.06
  4. Step 4: Simplify right side
    1,407.36x = 2,715,297.61
  5. Step 5: Solve for x
    x = 2,715,297.61/1,407.36
  6. Step 6: Final answer
    x = 1,929.36

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1.5x scale

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.