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Finding the Fourth Proportional to 792.22, 1,188.30 and 429.30

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Solution

The fourth proportional to 792.22, 1,188.30 and 429.30 is: 643.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    792.22 : 1,188.30 = 429.30 : x
  2. Step 2: Convert to fraction form
    792.22/1,188.30 = 429.30/x
  3. Step 3: Cross multiply
    792.22x = 1,188.30 × 429.30
  4. Step 4: Simplify right side
    792.22x = 510,137.19
  5. Step 5: Solve for x
    x = 510,137.19/792.22
  6. Step 6: Final answer
    x = 643.93

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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.