Home / 1,290.05-1,935.75-1,220.35

Finding the Fourth Proportional to 1,290.05, 1,935.75 and 1,220.35

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Solution

The fourth proportional to 1,290.05, 1,935.75 and 1,220.35 is: 1,831.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290.05 : 1,935.75 = 1,220.35 : x
  2. Step 2: Convert to fraction form
    1,290.05/1,935.75 = 1,220.35/x
  3. Step 3: Cross multiply
    1,290.05x = 1,935.75 × 1,220.35
  4. Step 4: Simplify right side
    1,290.05x = 2,362,282.83
  5. Step 5: Solve for x
    x = 2,362,282.83/1,290.05
  6. Step 6: Final answer
    x = 1,831.16

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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.