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Finding the Fourth Proportional to 450, 619.11 and 400.77

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Solution

The fourth proportional to 450, 619.11 and 400.77 is: 551.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    450 : 619.11 = 400.77 : x
  2. Step 2: Convert to fraction form
    450/619.11 = 400.77/x
  3. Step 3: Cross multiply
    450x = 619.11 × 400.77
  4. Step 4: Simplify right side
    450x = 248,120.71
  5. Step 5: Solve for x
    x = 248,120.71/450
  6. Step 6: Final answer
    x = 551.38

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1.5x scale

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.