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Finding the Fourth Proportional to 1,210.86, 1,670.81 and 679.77

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Solution

The fourth proportional to 1,210.86, 1,670.81 and 679.77 is: 937.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,210.86 : 1,670.81 = 679.77 : x
  2. Step 2: Convert to fraction form
    1,210.86/1,670.81 = 679.77/x
  3. Step 3: Cross multiply
    1,210.86x = 1,670.81 × 679.77
  4. Step 4: Simplify right side
    1,210.86x = 1,135,768.21
  5. Step 5: Solve for x
    x = 1,135,768.21/1,210.86
  6. Step 6: Final answer
    x = 937.98

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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.