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Finding the Fourth Proportional to 1,172.40, 1,618.01 and 675.21

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Solution

The fourth proportional to 1,172.40, 1,618.01 and 675.21 is: 931.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,172.40 : 1,618.01 = 675.21 : x
  2. Step 2: Convert to fraction form
    1,172.40/1,618.01 = 675.21/x
  3. Step 3: Cross multiply
    1,172.40x = 1,618.01 × 675.21
  4. Step 4: Simplify right side
    1,172.40x = 1,092,496.53
  5. Step 5: Solve for x
    x = 1,092,496.53/1,172.40
  6. Step 6: Final answer
    x = 931.85

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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.