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Finding the Fourth Proportional to 946.36, 1,305.50 and 553.30

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Solution

The fourth proportional to 946.36, 1,305.50 and 553.30 is: 763.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    946.36 : 1,305.50 = 553.30 : x
  2. Step 2: Convert to fraction form
    946.36/1,305.50 = 553.30/x
  3. Step 3: Cross multiply
    946.36x = 1,305.50 × 553.30
  4. Step 4: Simplify right side
    946.36x = 722,333.15
  5. Step 5: Solve for x
    x = 722,333.15/946.36
  6. Step 6: Final answer
    x = 763.28

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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.