Home / 1,190.90-1,786.35-421.40

Finding the Fourth Proportional to 1,190.90, 1,786.35 and 421.40

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Solution

The fourth proportional to 1,190.90, 1,786.35 and 421.40 is: 632.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,190.90 : 1,786.35 = 421.40 : x
  2. Step 2: Convert to fraction form
    1,190.90/1,786.35 = 421.40/x
  3. Step 3: Cross multiply
    1,190.90x = 1,786.35 × 421.40
  4. Step 4: Simplify right side
    1,190.90x = 752,767.89
  5. Step 5: Solve for x
    x = 752,767.89/1,190.90
  6. Step 6: Final answer
    x = 632.10

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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.