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Finding the Fourth Proportional to 1,019.39, 1,529.36 and 434.42

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Solution

The fourth proportional to 1,019.39, 1,529.36 and 434.42 is: 651.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,019.39 : 1,529.36 = 434.42 : x
  2. Step 2: Convert to fraction form
    1,019.39/1,529.36 = 434.42/x
  3. Step 3: Cross multiply
    1,019.39x = 1,529.36 × 434.42
  4. Step 4: Simplify right side
    1,019.39x = 664,374.75
  5. Step 5: Solve for x
    x = 664,374.75/1,019.39
  6. Step 6: Final answer
    x = 651.74

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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.