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Finding the Fourth Proportional to 405.90, 607.77 and 243.18

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Solution

The fourth proportional to 405.90, 607.77 and 243.18 is: 364.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.90 : 607.77 = 243.18 : x
  2. Step 2: Convert to fraction form
    405.90/607.77 = 243.18/x
  3. Step 3: Cross multiply
    405.90x = 607.77 × 243.18
  4. Step 4: Simplify right side
    405.90x = 147,797.51
  5. Step 5: Solve for x
    x = 147,797.51/405.90
  6. Step 6: Final answer
    x = 364.12

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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.