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Finding the Fourth Proportional to 405.84, 608.78 and 117.28

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Solution

The fourth proportional to 405.84, 608.78 and 117.28 is: 175.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.84 : 608.78 = 117.28 : x
  2. Step 2: Convert to fraction form
    405.84/608.78 = 117.28/x
  3. Step 3: Cross multiply
    405.84x = 608.78 × 117.28
  4. Step 4: Simplify right side
    405.84x = 71,398.77
  5. Step 5: Solve for x
    x = 71,398.77/405.84
  6. Step 6: Final answer
    x = 175.93

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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.