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Finding the Fourth Proportional to 405.61, 560.43 and 395.24

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Solution

The fourth proportional to 405.61, 560.43 and 395.24 is: 546.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.61 : 560.43 = 395.24 : x
  2. Step 2: Convert to fraction form
    405.61/560.43 = 395.24/x
  3. Step 3: Cross multiply
    405.61x = 560.43 × 395.24
  4. Step 4: Simplify right side
    405.61x = 221,504.35
  5. Step 5: Solve for x
    x = 221,504.35/405.61
  6. Step 6: Final answer
    x = 546.10

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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.