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Finding the Fourth Proportional to 405.50, 560.44 and 390.14

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Solution

The fourth proportional to 405.50, 560.44 and 390.14 is: 539.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.50 : 560.44 = 390.14 : x
  2. Step 2: Convert to fraction form
    405.50/560.44 = 390.14/x
  3. Step 3: Cross multiply
    405.50x = 560.44 × 390.14
  4. Step 4: Simplify right side
    405.50x = 218,646.28
  5. Step 5: Solve for x
    x = 218,646.28/405.50
  6. Step 6: Final answer
    x = 539.21

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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.