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Finding the Fourth Proportional to 1,210.45, 1,670.02 and 679.25

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Solution

The fourth proportional to 1,210.45, 1,670.02 and 679.25 is: 937.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,210.45 : 1,670.02 = 679.25 : x
  2. Step 2: Convert to fraction form
    1,210.45/1,670.02 = 679.25/x
  3. Step 3: Cross multiply
    1,210.45x = 1,670.02 × 679.25
  4. Step 4: Simplify right side
    1,210.45x = 1,134,361.09
  5. Step 5: Solve for x
    x = 1,134,361.09/1,210.45
  6. Step 6: Final answer
    x = 937.14

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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.