Home / 1,390.15-1,906.09-1,357.35

Finding the Fourth Proportional to 1,390.15, 1,906.09 and 1,357.35

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Solution

The fourth proportional to 1,390.15, 1,906.09 and 1,357.35 is: 1,861.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.15 : 1,906.09 = 1,357.35 : x
  2. Step 2: Convert to fraction form
    1,390.15/1,906.09 = 1,357.35/x
  3. Step 3: Cross multiply
    1,390.15x = 1,906.09 × 1,357.35
  4. Step 4: Simplify right side
    1,390.15x = 2,587,231.26
  5. Step 5: Solve for x
    x = 2,587,231.26/1,390.15
  6. Step 6: Final answer
    x = 1,861.12

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.