Home / 1,421.86-1,960.99-1,388.04

Finding the Fourth Proportional to 1,421.86, 1,960.99 and 1,388.04

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Solution

The fourth proportional to 1,421.86, 1,960.99 and 1,388.04 is: 1,914.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.86 : 1,960.99 = 1,388.04 : x
  2. Step 2: Convert to fraction form
    1,421.86/1,960.99 = 1,388.04/x
  3. Step 3: Cross multiply
    1,421.86x = 1,960.99 × 1,388.04
  4. Step 4: Simplify right side
    1,421.86x = 2,721,932.56
  5. Step 5: Solve for x
    x = 2,721,932.56/1,421.86
  6. Step 6: Final answer
    x = 1,914.35

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.