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Finding the Fourth Proportional to 355,611.21, 533,833.56 and 280,781.79

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Solution

The fourth proportional to 355,611.21, 533,833.56 and 280,781.79 is: 421,501.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    355,611.21 : 533,833.56 = 280,781.79 : x
  2. Step 2: Convert to fraction form
    355,611.21/533,833.56 = 280,781.79/x
  3. Step 3: Cross multiply
    355,611.21x = 533,833.56 × 280,781.79
  4. Step 4: Simplify right side
    355,611.21x = 149,890,742,538.87
  5. Step 5: Solve for x
    x = 149,890,742,538.87/355,611.21
  6. Step 6: Final answer
    x = 421,501.74

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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.