Home / 1,218.02-1,680.08-745.65

Finding the Fourth Proportional to 1,218.02, 1,680.08 and 745.65

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Solution

The fourth proportional to 1,218.02, 1,680.08 and 745.65 is: 1,028.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,218.02 : 1,680.08 = 745.65 : x
  2. Step 2: Convert to fraction form
    1,218.02/1,680.08 = 745.65/x
  3. Step 3: Cross multiply
    1,218.02x = 1,680.08 × 745.65
  4. Step 4: Simplify right side
    1,218.02x = 1,252,747.92
  5. Step 5: Solve for x
    x = 1,252,747.92/1,218.02
  6. Step 6: Final answer
    x = 1,028.52

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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.