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Finding the Fourth Proportional to 619.65, 854.55 and 409.77

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Solution

The fourth proportional to 619.65, 854.55 and 409.77 is: 565.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.65 : 854.55 = 409.77 : x
  2. Step 2: Convert to fraction form
    619.65/854.55 = 409.77/x
  3. Step 3: Cross multiply
    619.65x = 854.55 × 409.77
  4. Step 4: Simplify right side
    619.65x = 350,168.95
  5. Step 5: Solve for x
    x = 350,168.95/619.65
  6. Step 6: Final answer
    x = 565.11

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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.