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Finding the Fourth Proportional to 688,794,644.79, 950,495,649.32 and 391,395,611.12

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Solution

The fourth proportional to 688,794,644.79, 950,495,649.32 and 391,395,611.12 is: 540,102,668.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    688,794,644.79 : 950,495,649.32 = 391,395,611.12 : x
  2. Step 2: Convert to fraction form
    688,794,644.79/950,495,649.32 = 391,395,611.12/x
  3. Step 3: Cross multiply
    688,794,644.79x = 950,495,649.32 × 391,395,611.12
  4. Step 4: Simplify right side
    688,794,644.79x = 372,019,825,528,728,640
  5. Step 5: Solve for x
    x = 372,019,825,528,728,640/688,794,644.79
  6. Step 6: Final answer
    x = 540,102,668.25

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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.