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Finding the Fourth Proportional to 1,285.80, 1,928.81 and 555.38

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Solution

The fourth proportional to 1,285.80, 1,928.81 and 555.38 is: 833.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,285.80 : 1,928.81 = 555.38 : x
  2. Step 2: Convert to fraction form
    1,285.80/1,928.81 = 555.38/x
  3. Step 3: Cross multiply
    1,285.80x = 1,928.81 × 555.38
  4. Step 4: Simplify right side
    1,285.80x = 1,071,222.50
  5. Step 5: Solve for x
    x = 1,071,222.50/1,285.80
  6. Step 6: Final answer
    x = 833.12

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.