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Finding the Fourth Proportional to 667,279.44, 921,070.17 and 405,633.78

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Solution

The fourth proportional to 667,279.44, 921,070.17 and 405,633.78 is: 559,911.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    667,279.44 : 921,070.17 = 405,633.78 : x
  2. Step 2: Convert to fraction form
    667,279.44/921,070.17 = 405,633.78/x
  3. Step 3: Cross multiply
    667,279.44x = 921,070.17 × 405,633.78
  4. Step 4: Simplify right side
    667,279.44x = 373,617,174,702.34
  5. Step 5: Solve for x
    x = 373,617,174,702.34/667,279.44
  6. Step 6: Final answer
    x = 559,911.11

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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.