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Finding the Fourth Proportional to 1,387.87, 2,072.65 and 1,234.78

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Solution

The fourth proportional to 1,387.87, 2,072.65 and 1,234.78 is: 1,844.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.87 : 2,072.65 = 1,234.78 : x
  2. Step 2: Convert to fraction form
    1,387.87/2,072.65 = 1,234.78/x
  3. Step 3: Cross multiply
    1,387.87x = 2,072.65 × 1,234.78
  4. Step 4: Simplify right side
    1,387.87x = 2,559,271.29
  5. Step 5: Solve for x
    x = 2,559,271.29/1,387.87
  6. Step 6: Final answer
    x = 1,844.03

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.