Home / 1,421.55-1,968.30-1,394.21

Finding the Fourth Proportional to 1,421.55, 1,968.30 and 1,394.21

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Solution

The fourth proportional to 1,421.55, 1,968.30 and 1,394.21 is: 1,930.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.55 : 1,968.30 = 1,394.21 : x
  2. Step 2: Convert to fraction form
    1,421.55/1,968.30 = 1,394.21/x
  3. Step 3: Cross multiply
    1,421.55x = 1,968.30 × 1,394.21
  4. Step 4: Simplify right side
    1,421.55x = 2,744,228.46
  5. Step 5: Solve for x
    x = 2,744,228.46/1,421.55
  6. Step 6: Final answer
    x = 1,930.45

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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.