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Finding the Fourth Proportional to 1,907.80, 2,861.70 and 1,386.70

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Solution

The fourth proportional to 1,907.80, 2,861.70 and 1,386.70 is: 2,080.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,907.80 : 2,861.70 = 1,386.70 : x
  2. Step 2: Convert to fraction form
    1,907.80/2,861.70 = 1,386.70/x
  3. Step 3: Cross multiply
    1,907.80x = 2,861.70 × 1,386.70
  4. Step 4: Simplify right side
    1,907.80x = 3,968,319.39
  5. Step 5: Solve for x
    x = 3,968,319.39/1,907.80
  6. Step 6: Final answer
    x = 2,080.05

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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.