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Finding the Fourth Proportional to 640,978,521.20, 961,467,781.80 and 634,176,076.40

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Solution

The fourth proportional to 640,978,521.20, 961,467,781.80 and 634,176,076.40 is: 951,264,114.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,978,521.20 : 961,467,781.80 = 634,176,076.40 : x
  2. Step 2: Convert to fraction form
    640,978,521.20/961,467,781.80 = 634,176,076.40/x
  3. Step 3: Cross multiply
    640,978,521.20x = 961,467,781.80 × 634,176,076.40
  4. Step 4: Simplify right side
    640,978,521.20x = 609,739,865,446,935,296
  5. Step 5: Solve for x
    x = 609,739,865,446,935,296/640,978,521.20
  6. Step 6: Final answer
    x = 951,264,114.60

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1.5x scale

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.