Home / 1,407.36-2,109.68-1,287.08

Finding the Fourth Proportional to 1,407.36, 2,109.68 and 1,287.08

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Solution

The fourth proportional to 1,407.36, 2,109.68 and 1,287.08 is: 1,929.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,407.36 : 2,109.68 = 1,287.08 : x
  2. Step 2: Convert to fraction form
    1,407.36/2,109.68 = 1,287.08/x
  3. Step 3: Cross multiply
    1,407.36x = 2,109.68 × 1,287.08
  4. Step 4: Simplify right side
    1,407.36x = 2,715,326.93
  5. Step 5: Solve for x
    x = 2,715,326.93/1,407.36
  6. Step 6: Final answer
    x = 1,929.38

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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.