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Finding the Fourth Proportional to 667,390.88, 921,018.12 and 405,745.76

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Solution

The fourth proportional to 667,390.88, 921,018.12 and 405,745.76 is: 559,940.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    667,390.88 : 921,018.12 = 405,745.76 : x
  2. Step 2: Convert to fraction form
    667,390.88/921,018.12 = 405,745.76/x
  3. Step 3: Cross multiply
    667,390.88x = 921,018.12 × 405,745.76
  4. Step 4: Simplify right side
    667,390.88x = 373,699,197,073.17
  5. Step 5: Solve for x
    x = 373,699,197,073.17/667,390.88
  6. Step 6: Final answer
    x = 559,940.52

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1.5x scale

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.