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Finding the Fourth Proportional to 1,153.63, 1,730.85 and 720.28

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Solution

The fourth proportional to 1,153.63, 1,730.85 and 720.28 is: 1,080.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,153.63 : 1,730.85 = 720.28 : x
  2. Step 2: Convert to fraction form
    1,153.63/1,730.85 = 720.28/x
  3. Step 3: Cross multiply
    1,153.63x = 1,730.85 × 720.28
  4. Step 4: Simplify right side
    1,153.63x = 1,246,696.64
  5. Step 5: Solve for x
    x = 1,246,696.64/1,153.63
  6. Step 6: Final answer
    x = 1,080.67

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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.