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Finding the Fourth Proportional to 1,210.72, 1,670.66 and 679.50

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Solution

The fourth proportional to 1,210.72, 1,670.66 and 679.50 is: 937.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,210.72 : 1,670.66 = 679.50 : x
  2. Step 2: Convert to fraction form
    1,210.72/1,670.66 = 679.50/x
  3. Step 3: Cross multiply
    1,210.72x = 1,670.66 × 679.50
  4. Step 4: Simplify right side
    1,210.72x = 1,135,208.90
  5. Step 5: Solve for x
    x = 1,135,208.90/1,210.72
  6. Step 6: Final answer
    x = 937.63

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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.