Home / 1,040.51-1,560.56-309.89

Finding the Fourth Proportional to 1,040.51, 1,560.56 and 309.89

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Solution

The fourth proportional to 1,040.51, 1,560.56 and 309.89 is: 464.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,040.51 : 1,560.56 = 309.89 : x
  2. Step 2: Convert to fraction form
    1,040.51/1,560.56 = 309.89/x
  3. Step 3: Cross multiply
    1,040.51x = 1,560.56 × 309.89
  4. Step 4: Simplify right side
    1,040.51x = 483,604.29
  5. Step 5: Solve for x
    x = 483,604.29/1,040.51
  6. Step 6: Final answer
    x = 464.78

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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.