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Finding the Fourth Proportional to 129,484.34, 178,619.81 and 89,127.98

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Solution

The fourth proportional to 129,484.34, 178,619.81 and 89,127.98 is: 122,949.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,484.34 : 178,619.81 = 89,127.98 : x
  2. Step 2: Convert to fraction form
    129,484.34/178,619.81 = 89,127.98/x
  3. Step 3: Cross multiply
    129,484.34x = 178,619.81 × 89,127.98
  4. Step 4: Simplify right side
    129,484.34x = 15,920,021,514.54
  5. Step 5: Solve for x
    x = 15,920,021,514.54/129,484.34
  6. Step 6: Final answer
    x = 122,949.40

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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.