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Finding the Fourth Proportional to 1,019.13, 1,529.31 and 671.64

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Solution

The fourth proportional to 1,019.13, 1,529.31 and 671.64 is: 1,007.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,019.13 : 1,529.31 = 671.64 : x
  2. Step 2: Convert to fraction form
    1,019.13/1,529.31 = 671.64/x
  3. Step 3: Cross multiply
    1,019.13x = 1,529.31 × 671.64
  4. Step 4: Simplify right side
    1,019.13x = 1,027,145.77
  5. Step 5: Solve for x
    x = 1,027,145.77/1,019.13
  6. Step 6: Final answer
    x = 1,007.87

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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.