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Finding the Fourth Proportional to 664,862.40, 996,710.40 and 398,728.80

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Solution

The fourth proportional to 664,862.40, 996,710.40 and 398,728.80 is: 597,743.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,862.40 : 996,710.40 = 398,728.80 : x
  2. Step 2: Convert to fraction form
    664,862.40/996,710.40 = 398,728.80/x
  3. Step 3: Cross multiply
    664,862.40x = 996,710.40 × 398,728.80
  4. Step 4: Simplify right side
    664,862.40x = 397,417,141,739.52
  5. Step 5: Solve for x
    x = 397,417,141,739.52/664,862.40
  6. Step 6: Final answer
    x = 597,743.45

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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.