Home / 3,780.80-5,669.85-1,315.70

Finding the Fourth Proportional to 3,780.80, 5,669.85 and 1,315.70

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Solution

The fourth proportional to 3,780.80, 5,669.85 and 1,315.70 is: 1,973.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,780.80 : 5,669.85 = 1,315.70 : x
  2. Step 2: Convert to fraction form
    3,780.80/5,669.85 = 1,315.70/x
  3. Step 3: Cross multiply
    3,780.80x = 5,669.85 × 1,315.70
  4. Step 4: Simplify right side
    3,780.80x = 7,459,821.65
  5. Step 5: Solve for x
    x = 7,459,821.65/3,780.80
  6. Step 6: Final answer
    x = 1,973.08

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1.5x scale

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.