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Finding the Fourth Proportional to 78,669.74, 108,563.64 and 42,859.64

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Solution

The fourth proportional to 78,669.74, 108,563.64 and 42,859.64 is: 59,145.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,669.74 : 108,563.64 = 42,859.64 : x
  2. Step 2: Convert to fraction form
    78,669.74/108,563.64 = 42,859.64/x
  3. Step 3: Cross multiply
    78,669.74x = 108,563.64 × 42,859.64
  4. Step 4: Simplify right side
    78,669.74x = 4,652,998,527.49
  5. Step 5: Solve for x
    x = 4,652,998,527.49/78,669.74
  6. Step 6: Final answer
    x = 59,145.98

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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.