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Finding the Fourth Proportional to 82,607,978.60, 123,911,967.90 and 39,561,257.60

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Solution

The fourth proportional to 82,607,978.60, 123,911,967.90 and 39,561,257.60 is: 59,341,886.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    82,607,978.60 : 123,911,967.90 = 39,561,257.60 : x
  2. Step 2: Convert to fraction form
    82,607,978.60/123,911,967.90 = 39,561,257.60/x
  3. Step 3: Cross multiply
    82,607,978.60x = 123,911,967.90 × 39,561,257.60
  4. Step 4: Simplify right side
    82,607,978.60x = 4,902,113,281,814,831
  5. Step 5: Solve for x
    x = 4,902,113,281,814,831/82,607,978.60
  6. Step 6: Final answer
    x = 59,341,886.40

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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.