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Finding the Fourth Proportional to 1,319.51, 1,820.29 and 871.85

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Solution

The fourth proportional to 1,319.51, 1,820.29 and 871.85 is: 1,202.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.51 : 1,820.29 = 871.85 : x
  2. Step 2: Convert to fraction form
    1,319.51/1,820.29 = 871.85/x
  3. Step 3: Cross multiply
    1,319.51x = 1,820.29 × 871.85
  4. Step 4: Simplify right side
    1,319.51x = 1,587,019.84
  5. Step 5: Solve for x
    x = 1,587,019.84/1,319.51
  6. Step 6: Final answer
    x = 1,202.73

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.