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Finding the Fourth Proportional to 129,330.88, 178,420.08 and 79,000

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Solution

The fourth proportional to 129,330.88, 178,420.08 and 79,000 is: 108,985.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,330.88 : 178,420.08 = 79,000 : x
  2. Step 2: Convert to fraction form
    129,330.88/178,420.08 = 79,000/x
  3. Step 3: Cross multiply
    129,330.88x = 178,420.08 × 79,000
  4. Step 4: Simplify right side
    129,330.88x = 14,095,186,320.00
  5. Step 5: Solve for x
    x = 14,095,186,320.00/129,330.88
  6. Step 6: Final answer
    x = 108,985.47

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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.