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Finding the Fourth Proportional to 946.66, 1,306.59 and 553.78

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Solution

The fourth proportional to 946.66, 1,306.59 and 553.78 is: 764.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    946.66 : 1,306.59 = 553.78 : x
  2. Step 2: Convert to fraction form
    946.66/1,306.59 = 553.78/x
  3. Step 3: Cross multiply
    946.66x = 1,306.59 × 553.78
  4. Step 4: Simplify right side
    946.66x = 723,560.64
  5. Step 5: Solve for x
    x = 723,560.64/946.66
  6. Step 6: Final answer
    x = 764.33

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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.