Home / 2,130.31-2,939-1,290.45

Finding the Fourth Proportional to 2,130.31, 2,939 and 1,290.45

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Solution

The fourth proportional to 2,130.31, 2,939 and 1,290.45 is: 1,780.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,130.31 : 2,939 = 1,290.45 : x
  2. Step 2: Convert to fraction form
    2,130.31/2,939 = 1,290.45/x
  3. Step 3: Cross multiply
    2,130.31x = 2,939 × 1,290.45
  4. Step 4: Simplify right side
    2,130.31x = 3,792,632.55
  5. Step 5: Solve for x
    x = 3,792,632.55/2,130.31
  6. Step 6: Final answer
    x = 1,780.32

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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.