Home / 1,320.50-1,980.75-346.61

Finding the Fourth Proportional to 1,320.50, 1,980.75 and 346.61

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Solution

The fourth proportional to 1,320.50, 1,980.75 and 346.61 is: 519.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320.50 : 1,980.75 = 346.61 : x
  2. Step 2: Convert to fraction form
    1,320.50/1,980.75 = 346.61/x
  3. Step 3: Cross multiply
    1,320.50x = 1,980.75 × 346.61
  4. Step 4: Simplify right side
    1,320.50x = 686,537.85
  5. Step 5: Solve for x
    x = 686,537.85/1,320.50
  6. Step 6: Final answer
    x = 519.91

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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.