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Finding the Fourth Proportional to 611,336.30, 917,004.45 and 398,759.90

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Solution

The fourth proportional to 611,336.30, 917,004.45 and 398,759.90 is: 598,139.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,336.30 : 917,004.45 = 398,759.90 : x
  2. Step 2: Convert to fraction form
    611,336.30/917,004.45 = 398,759.90/x
  3. Step 3: Cross multiply
    611,336.30x = 917,004.45 × 398,759.90
  4. Step 4: Simplify right side
    611,336.30x = 365,664,602,781.56
  5. Step 5: Solve for x
    x = 365,664,602,781.56/611,336.30
  6. Step 6: Final answer
    x = 598,139.85

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.