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Finding the Fourth Proportional to 1,175.72, 1,621.60 and 783.26

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Solution

The fourth proportional to 1,175.72, 1,621.60 and 783.26 is: 1,080.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,175.72 : 1,621.60 = 783.26 : x
  2. Step 2: Convert to fraction form
    1,175.72/1,621.60 = 783.26/x
  3. Step 3: Cross multiply
    1,175.72x = 1,621.60 × 783.26
  4. Step 4: Simplify right side
    1,175.72x = 1,270,134.42
  5. Step 5: Solve for x
    x = 1,270,134.42/1,175.72
  6. Step 6: Final answer
    x = 1,080.30

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.