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Finding the Fourth Proportional to 1,152.09, 1,728.16 and 459.09

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Solution

The fourth proportional to 1,152.09, 1,728.16 and 459.09 is: 688.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,152.09 : 1,728.16 = 459.09 : x
  2. Step 2: Convert to fraction form
    1,152.09/1,728.16 = 459.09/x
  3. Step 3: Cross multiply
    1,152.09x = 1,728.16 × 459.09
  4. Step 4: Simplify right side
    1,152.09x = 793,379.83
  5. Step 5: Solve for x
    x = 793,379.83/1,152.09
  6. Step 6: Final answer
    x = 688.64

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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.