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Finding the Fourth Proportional to 860,915.40, 1,290,912.30 and 361,715.40

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Solution

The fourth proportional to 860,915.40, 1,290,912.30 and 361,715.40 is: 542,379.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    860,915.40 : 1,290,912.30 = 361,715.40 : x
  2. Step 2: Convert to fraction form
    860,915.40/1,290,912.30 = 361,715.40/x
  3. Step 3: Cross multiply
    860,915.40x = 1,290,912.30 × 361,715.40
  4. Step 4: Simplify right side
    860,915.40x = 466,942,858,959.42
  5. Step 5: Solve for x
    x = 466,942,858,959.42/860,915.40
  6. Step 6: Final answer
    x = 542,379.49

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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.