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Finding the Fourth Proportional to 1,153.30, 1,728.88 and 459.80

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Solution

The fourth proportional to 1,153.30, 1,728.88 and 459.80 is: 689.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,153.30 : 1,728.88 = 459.80 : x
  2. Step 2: Convert to fraction form
    1,153.30/1,728.88 = 459.80/x
  3. Step 3: Cross multiply
    1,153.30x = 1,728.88 × 459.80
  4. Step 4: Simplify right side
    1,153.30x = 794,933.76
  5. Step 5: Solve for x
    x = 794,933.76/1,153.30
  6. Step 6: Final answer
    x = 689.27

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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.