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Finding the Fourth Proportional to 2,420.89, 3,631.26 and 689.51

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Solution

The fourth proportional to 2,420.89, 3,631.26 and 689.51 is: 1,034.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,420.89 : 3,631.26 = 689.51 : x
  2. Step 2: Convert to fraction form
    2,420.89/3,631.26 = 689.51/x
  3. Step 3: Cross multiply
    2,420.89x = 3,631.26 × 689.51
  4. Step 4: Simplify right side
    2,420.89x = 2,503,795.71
  5. Step 5: Solve for x
    x = 2,503,795.71/2,420.89
  6. Step 6: Final answer
    x = 1,034.25

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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.