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Finding the Fourth Proportional to 640,432.40, 959,611.80 and 403,350.80

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Solution

The fourth proportional to 640,432.40, 959,611.80 and 403,350.80 is: 604,373.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,432.40 : 959,611.80 = 403,350.80 : x
  2. Step 2: Convert to fraction form
    640,432.40/959,611.80 = 403,350.80/x
  3. Step 3: Cross multiply
    640,432.40x = 959,611.80 × 403,350.80
  4. Step 4: Simplify right side
    640,432.40x = 387,060,187,219.44
  5. Step 5: Solve for x
    x = 387,060,187,219.44/640,432.40
  6. Step 6: Final answer
    x = 604,373.21

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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.