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Finding the Fourth Proportional to 1,208.40, 1,667.54 and 684.40

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Solution

The fourth proportional to 1,208.40, 1,667.54 and 684.40 is: 944.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,208.40 : 1,667.54 = 684.40 : x
  2. Step 2: Convert to fraction form
    1,208.40/1,667.54 = 684.40/x
  3. Step 3: Cross multiply
    1,208.40x = 1,667.54 × 684.40
  4. Step 4: Simplify right side
    1,208.40x = 1,141,264.38
  5. Step 5: Solve for x
    x = 1,141,264.38/1,208.40
  6. Step 6: Final answer
    x = 944.44

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Half 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.