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Finding the Fourth Proportional to 665,650.56, 918,662.07 and 393,805.86

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Solution

The fourth proportional to 665,650.56, 918,662.07 and 393,805.86 is: 543,490.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,650.56 : 918,662.07 = 393,805.86 : x
  2. Step 2: Convert to fraction form
    665,650.56/918,662.07 = 393,805.86/x
  3. Step 3: Cross multiply
    665,650.56x = 918,662.07 × 393,805.86
  4. Step 4: Simplify right side
    665,650.56x = 361,774,506,525.73
  5. Step 5: Solve for x
    x = 361,774,506,525.73/665,650.56
  6. Step 6: Final answer
    x = 543,490.13

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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.