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Finding the Fourth Proportional to 18,985,978, 28,467,484.80 and 7,457,644.72

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Solution

The fourth proportional to 18,985,978, 28,467,484.80 and 7,457,644.72 is: 11,181,956.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,985,978 : 28,467,484.80 = 7,457,644.72 : x
  2. Step 2: Convert to fraction form
    18,985,978/28,467,484.80 = 7,457,644.72/x
  3. Step 3: Cross multiply
    18,985,978x = 28,467,484.80 × 7,457,644.72
  4. Step 4: Simplify right side
    18,985,978x = 212,300,387,710,400.25
  5. Step 5: Solve for x
    x = 212,300,387,710,400.25/18,985,978
  6. Step 6: Final answer
    x = 11,181,956.90

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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.