Home / 2,421.63-3,631.36-689.85

Finding the Fourth Proportional to 2,421.63, 3,631.36 and 689.85

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Solution

The fourth proportional to 2,421.63, 3,631.36 and 689.85 is: 1,034.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,421.63 : 3,631.36 = 689.85 : x
  2. Step 2: Convert to fraction form
    2,421.63/3,631.36 = 689.85/x
  3. Step 3: Cross multiply
    2,421.63x = 3,631.36 × 689.85
  4. Step 4: Simplify right side
    2,421.63x = 2,505,087.75
  5. Step 5: Solve for x
    x = 2,505,087.75/2,421.63
  6. Step 6: Final answer
    x = 1,034.46

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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.