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Finding the Fourth Proportional to 129,897.96, 179,239.97 and 78,884.16

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Solution

The fourth proportional to 129,897.96, 179,239.97 and 78,884.16 is: 108,848.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,897.96 : 179,239.97 = 78,884.16 : x
  2. Step 2: Convert to fraction form
    129,897.96/179,239.97 = 78,884.16/x
  3. Step 3: Cross multiply
    129,897.96x = 179,239.97 × 78,884.16
  4. Step 4: Simplify right side
    129,897.96x = 14,139,194,077.45
  5. Step 5: Solve for x
    x = 14,139,194,077.45/129,897.96
  6. Step 6: Final answer
    x = 108,848.47

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1.5x scale

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.