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Finding the Fourth Proportional to 135,641.76, 187,208.64 and 79,080.72

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Solution

The fourth proportional to 135,641.76, 187,208.64 and 79,080.72 is: 109,144.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,641.76 : 187,208.64 = 79,080.72 : x
  2. Step 2: Convert to fraction form
    135,641.76/187,208.64 = 79,080.72/x
  3. Step 3: Cross multiply
    135,641.76x = 187,208.64 × 79,080.72
  4. Step 4: Simplify right side
    135,641.76x = 14,804,594,041.42
  5. Step 5: Solve for x
    x = 14,804,594,041.42/135,641.76
  6. Step 6: Final answer
    x = 109,144.81

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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.