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Finding the Fourth Proportional to 665,649.12, 918,488.52 and 379,174.80

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Solution

The fourth proportional to 665,649.12, 918,488.52 and 379,174.80 is: 523,200.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,649.12 : 918,488.52 = 379,174.80 : x
  2. Step 2: Convert to fraction form
    665,649.12/918,488.52 = 379,174.80/x
  3. Step 3: Cross multiply
    665,649.12x = 918,488.52 × 379,174.80
  4. Step 4: Simplify right side
    665,649.12x = 348,267,700,873.30
  5. Step 5: Solve for x
    x = 348,267,700,873.30/665,649.12
  6. Step 6: Final answer
    x = 523,200.12

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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.