Home / 1,620.47-2,429.93-742.70

Finding the Fourth Proportional to 1,620.47, 2,429.93 and 742.70

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Solution

The fourth proportional to 1,620.47, 2,429.93 and 742.70 is: 1,113.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,620.47 : 2,429.93 = 742.70 : x
  2. Step 2: Convert to fraction form
    1,620.47/2,429.93 = 742.70/x
  3. Step 3: Cross multiply
    1,620.47x = 2,429.93 × 742.70
  4. Step 4: Simplify right side
    1,620.47x = 1,804,716.94
  5. Step 5: Solve for x
    x = 1,804,716.94/1,620.47
  6. Step 6: Final answer
    x = 1,113.70

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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.