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Finding the Fourth Proportional to 722.32, 1,080.79 and 429.99

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Solution

The fourth proportional to 722.32, 1,080.79 and 429.99 is: 643.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.32 : 1,080.79 = 429.99 : x
  2. Step 2: Convert to fraction form
    722.32/1,080.79 = 429.99/x
  3. Step 3: Cross multiply
    722.32x = 1,080.79 × 429.99
  4. Step 4: Simplify right side
    722.32x = 464,723.76
  5. Step 5: Solve for x
    x = 464,723.76/722.32
  6. Step 6: Final answer
    x = 643.38

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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.