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Finding the Fourth Proportional to 129,745, 179,048.12 and 70,129

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Solution

The fourth proportional to 129,745, 179,048.12 and 70,129 is: 96,778.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,745 : 179,048.12 = 70,129 : x
  2. Step 2: Convert to fraction form
    129,745/179,048.12 = 70,129/x
  3. Step 3: Cross multiply
    129,745x = 179,048.12 × 70,129
  4. Step 4: Simplify right side
    129,745x = 12,556,465,607.48
  5. Step 5: Solve for x
    x = 12,556,465,607.48/129,745
  6. Step 6: Final answer
    x = 96,778.03

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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.