Home / 1,320.50-1,980.74-1,240.31

Finding the Fourth Proportional to 1,320.50, 1,980.74 and 1,240.31

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Solution

The fourth proportional to 1,320.50, 1,980.74 and 1,240.31 is: 1,860.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320.50 : 1,980.74 = 1,240.31 : x
  2. Step 2: Convert to fraction form
    1,320.50/1,980.74 = 1,240.31/x
  3. Step 3: Cross multiply
    1,320.50x = 1,980.74 × 1,240.31
  4. Step 4: Simplify right side
    1,320.50x = 2,456,725.43
  5. Step 5: Solve for x
    x = 2,456,725.43/1,320.50
  6. Step 6: Final answer
    x = 1,860.45

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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.