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Finding the Fourth Proportional to 667,423.86, 921,059.61 and 380,938.02

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Solution

The fourth proportional to 667,423.86, 921,059.61 and 380,938.02 is: 525,702.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    667,423.86 : 921,059.61 = 380,938.02 : x
  2. Step 2: Convert to fraction form
    667,423.86/921,059.61 = 380,938.02/x
  3. Step 3: Cross multiply
    667,423.86x = 921,059.61 × 380,938.02
  4. Step 4: Simplify right side
    667,423.86x = 350,866,624,135.37
  5. Step 5: Solve for x
    x = 350,866,624,135.37/667,423.86
  6. Step 6: Final answer
    x = 525,702.85

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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.