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Finding the Fourth Proportional to 289,687.80, 434,531.70 and 79,325.40

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Solution

The fourth proportional to 289,687.80, 434,531.70 and 79,325.40 is: 118,988.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    289,687.80 : 434,531.70 = 79,325.40 : x
  2. Step 2: Convert to fraction form
    289,687.80/434,531.70 = 79,325.40/x
  3. Step 3: Cross multiply
    289,687.80x = 434,531.70 × 79,325.40
  4. Step 4: Simplify right side
    289,687.80x = 34,469,400,915.18
  5. Step 5: Solve for x
    x = 34,469,400,915.18/289,687.80
  6. Step 6: Final answer
    x = 118,988.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.