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Finding the Fourth Proportional to 56,978,026.61, 78,656,787.60 and 38,171,990.36

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Solution

The fourth proportional to 56,978,026.61, 78,656,787.60 and 38,171,990.36 is: 52,695,509.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    56,978,026.61 : 78,656,787.60 = 38,171,990.36 : x
  2. Step 2: Convert to fraction form
    56,978,026.61/78,656,787.60 = 38,171,990.36/x
  3. Step 3: Cross multiply
    56,978,026.61x = 78,656,787.60 × 38,171,990.36
  4. Step 4: Simplify right side
    56,978,026.61x = 3,002,486,138,015,767.50
  5. Step 5: Solve for x
    x = 3,002,486,138,015,767.50/56,978,026.61
  6. Step 6: Final answer
    x = 52,695,509.42

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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.