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Finding the Fourth Proportional to 405.39, 559.35 and 322.77

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Solution

The fourth proportional to 405.39, 559.35 and 322.77 is: 445.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.39 : 559.35 = 322.77 : x
  2. Step 2: Convert to fraction form
    405.39/559.35 = 322.77/x
  3. Step 3: Cross multiply
    405.39x = 559.35 × 322.77
  4. Step 4: Simplify right side
    405.39x = 180,541.40
  5. Step 5: Solve for x
    x = 180,541.40/405.39
  6. Step 6: Final answer
    x = 445.35

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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.