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Finding the Fourth Proportional to 103,431.16, 155,143.64 and 28,555.88

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Solution

The fourth proportional to 103,431.16, 155,143.64 and 28,555.88 is: 42,832.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,431.16 : 155,143.64 = 28,555.88 : x
  2. Step 2: Convert to fraction form
    103,431.16/155,143.64 = 28,555.88/x
  3. Step 3: Cross multiply
    103,431.16x = 155,143.64 × 28,555.88
  4. Step 4: Simplify right side
    103,431.16x = 4,430,262,390.89
  5. Step 5: Solve for x
    x = 4,430,262,390.89/103,431.16
  6. Step 6: Final answer
    x = 42,832.96

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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.