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Finding the Fourth Proportional to 1,280.61, 1,920.70 and 355.92

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Solution

The fourth proportional to 1,280.61, 1,920.70 and 355.92 is: 533.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.61 : 1,920.70 = 355.92 : x
  2. Step 2: Convert to fraction form
    1,280.61/1,920.70 = 355.92/x
  3. Step 3: Cross multiply
    1,280.61x = 1,920.70 × 355.92
  4. Step 4: Simplify right side
    1,280.61x = 683,614.65
  5. Step 5: Solve for x
    x = 683,614.65/1,280.61
  6. Step 6: Final answer
    x = 533.82

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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.