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Finding the Fourth Proportional to 1,210.81, 1,671.05 and 679.78

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Solution

The fourth proportional to 1,210.81, 1,671.05 and 679.78 is: 938.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,210.81 : 1,671.05 = 679.78 : x
  2. Step 2: Convert to fraction form
    1,210.81/1,671.05 = 679.78/x
  3. Step 3: Cross multiply
    1,210.81x = 1,671.05 × 679.78
  4. Step 4: Simplify right side
    1,210.81x = 1,135,946.37
  5. Step 5: Solve for x
    x = 1,135,946.37/1,210.81
  6. Step 6: Final answer
    x = 938.17

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Double scale
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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.