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Finding the Fourth Proportional to 2,509.57, 3,463.21 and 1,390.57

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Solution

The fourth proportional to 2,509.57, 3,463.21 and 1,390.57 is: 1,918.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,509.57 : 3,463.21 = 1,390.57 : x
  2. Step 2: Convert to fraction form
    2,509.57/3,463.21 = 1,390.57/x
  3. Step 3: Cross multiply
    2,509.57x = 3,463.21 × 1,390.57
  4. Step 4: Simplify right side
    2,509.57x = 4,815,821.19
  5. Step 5: Solve for x
    x = 4,815,821.19/2,509.57
  6. Step 6: Final answer
    x = 1,918.99

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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.