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Finding the Fourth Proportional to 800.32, 1,199.47 and 429.21

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Solution

The fourth proportional to 800.32, 1,199.47 and 429.21 is: 643.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    800.32 : 1,199.47 = 429.21 : x
  2. Step 2: Convert to fraction form
    800.32/1,199.47 = 429.21/x
  3. Step 3: Cross multiply
    800.32x = 1,199.47 × 429.21
  4. Step 4: Simplify right side
    800.32x = 514,817.45
  5. Step 5: Solve for x
    x = 514,817.45/800.32
  6. Step 6: Final answer
    x = 643.26

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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.