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Finding the Fourth Proportional to 1,175.21, 1,621.76 and 644.09

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Solution

The fourth proportional to 1,175.21, 1,621.76 and 644.09 is: 888.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,175.21 : 1,621.76 = 644.09 : x
  2. Step 2: Convert to fraction form
    1,175.21/1,621.76 = 644.09/x
  3. Step 3: Cross multiply
    1,175.21x = 1,621.76 × 644.09
  4. Step 4: Simplify right side
    1,175.21x = 1,044,560.23
  5. Step 5: Solve for x
    x = 1,044,560.23/1,175.21
  6. Step 6: Final answer
    x = 888.83

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1.5x scale

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.