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Finding the Fourth Proportional to 643,915.40, 966,650.70 and 639,249.80

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Solution

The fourth proportional to 643,915.40, 966,650.70 and 639,249.80 is: 959,646.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,915.40 : 966,650.70 = 639,249.80 : x
  2. Step 2: Convert to fraction form
    643,915.40/966,650.70 = 639,249.80/x
  3. Step 3: Cross multiply
    643,915.40x = 966,650.70 × 639,249.80
  4. Step 4: Simplify right side
    643,915.40x = 617,931,266,644.86
  5. Step 5: Solve for x
    x = 617,931,266,644.86/643,915.40
  6. Step 6: Final answer
    x = 959,646.67

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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.