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Finding the Fourth Proportional to 405.96, 560.48 and 281.76

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Solution

The fourth proportional to 405.96, 560.48 and 281.76 is: 389.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.96 : 560.48 = 281.76 : x
  2. Step 2: Convert to fraction form
    405.96/560.48 = 281.76/x
  3. Step 3: Cross multiply
    405.96x = 560.48 × 281.76
  4. Step 4: Simplify right side
    405.96x = 157,920.84
  5. Step 5: Solve for x
    x = 157,920.84/405.96
  6. Step 6: Final answer
    x = 389.01

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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.