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Finding the Fourth Proportional to 1,420.07, 2,127.78 and 871.09

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Solution

The fourth proportional to 1,420.07, 2,127.78 and 871.09 is: 1,305.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.07 : 2,127.78 = 871.09 : x
  2. Step 2: Convert to fraction form
    1,420.07/2,127.78 = 871.09/x
  3. Step 3: Cross multiply
    1,420.07x = 2,127.78 × 871.09
  4. Step 4: Simplify right side
    1,420.07x = 1,853,482.56
  5. Step 5: Solve for x
    x = 1,853,482.56/1,420.07
  6. Step 6: Final answer
    x = 1,305.21

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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.