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Finding the Fourth Proportional to 405.86, 607.55 and 243.86

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Solution

The fourth proportional to 405.86, 607.55 and 243.86 is: 365.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.86 : 607.55 = 243.86 : x
  2. Step 2: Convert to fraction form
    405.86/607.55 = 243.86/x
  3. Step 3: Cross multiply
    405.86x = 607.55 × 243.86
  4. Step 4: Simplify right side
    405.86x = 148,152.89
  5. Step 5: Solve for x
    x = 148,152.89/405.86
  6. Step 6: Final answer
    x = 365.04

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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.