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Finding the Fourth Proportional to 405.84, 605.18 and 402.18

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Solution

The fourth proportional to 405.84, 605.18 and 402.18 is: 599.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.84 : 605.18 = 402.18 : x
  2. Step 2: Convert to fraction form
    405.84/605.18 = 402.18/x
  3. Step 3: Cross multiply
    405.84x = 605.18 × 402.18
  4. Step 4: Simplify right side
    405.84x = 243,391.29
  5. Step 5: Solve for x
    x = 243,391.29/405.84
  6. Step 6: Final answer
    x = 599.72

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.