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Finding the Fourth Proportional to 946.30, 1,305.99 and 553.45

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Solution

The fourth proportional to 946.30, 1,305.99 and 553.45 is: 763.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    946.30 : 1,305.99 = 553.45 : x
  2. Step 2: Convert to fraction form
    946.30/1,305.99 = 553.45/x
  3. Step 3: Cross multiply
    946.30x = 1,305.99 × 553.45
  4. Step 4: Simplify right side
    946.30x = 722,800.17
  5. Step 5: Solve for x
    x = 722,800.17/946.30
  6. Step 6: Final answer
    x = 763.82

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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.