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Finding the Fourth Proportional to 405.95, 608.92 and 261.77

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Solution

The fourth proportional to 405.95, 608.92 and 261.77 is: 392.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.95 : 608.92 = 261.77 : x
  2. Step 2: Convert to fraction form
    405.95/608.92 = 261.77/x
  3. Step 3: Cross multiply
    405.95x = 608.92 × 261.77
  4. Step 4: Simplify right side
    405.95x = 159,393.29
  5. Step 5: Solve for x
    x = 159,393.29/405.95
  6. Step 6: Final answer
    x = 392.65

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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.