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Finding the Fourth Proportional to 946.32, 1,305.60 and 667.28

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Solution

The fourth proportional to 946.32, 1,305.60 and 667.28 is: 920.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    946.32 : 1,305.60 = 667.28 : x
  2. Step 2: Convert to fraction form
    946.32/1,305.60 = 667.28/x
  3. Step 3: Cross multiply
    946.32x = 1,305.60 × 667.28
  4. Step 4: Simplify right side
    946.32x = 871,200.77
  5. Step 5: Solve for x
    x = 871,200.77/946.32
  6. Step 6: Final answer
    x = 920.62

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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.