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Finding the Fourth Proportional to 626,761,232.34, 864,018,917 and 438,003,485.78

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Solution

The fourth proportional to 626,761,232.34, 864,018,917 and 438,003,485.78 is: 603,807,762.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    626,761,232.34 : 864,018,917 = 438,003,485.78 : x
  2. Step 2: Convert to fraction form
    626,761,232.34/864,018,917 = 438,003,485.78/x
  3. Step 3: Cross multiply
    626,761,232.34x = 864,018,917 × 438,003,485.78
  4. Step 4: Simplify right side
    626,761,232.34x = 378,443,297,425,860,480
  5. Step 5: Solve for x
    x = 378,443,297,425,860,480/626,761,232.34
  6. Step 6: Final answer
    x = 603,807,762.67

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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.