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Finding the Fourth Proportional to 1,153.36, 1,728.75 and 459.84

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Solution

The fourth proportional to 1,153.36, 1,728.75 and 459.84 is: 689.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,153.36 : 1,728.75 = 459.84 : x
  2. Step 2: Convert to fraction form
    1,153.36/1,728.75 = 459.84/x
  3. Step 3: Cross multiply
    1,153.36x = 1,728.75 × 459.84
  4. Step 4: Simplify right side
    1,153.36x = 794,948.40
  5. Step 5: Solve for x
    x = 794,948.40/1,153.36
  6. Step 6: Final answer
    x = 689.25

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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.