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Finding the Fourth Proportional to 665,448.60, 996,860.70 and 398,415.90

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Solution

The fourth proportional to 665,448.60, 996,860.70 and 398,415.90 is: 596,838.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,448.60 : 996,860.70 = 398,415.90 : x
  2. Step 2: Convert to fraction form
    665,448.60/996,860.70 = 398,415.90/x
  3. Step 3: Cross multiply
    665,448.60x = 996,860.70 × 398,415.90
  4. Step 4: Simplify right side
    665,448.60x = 397,165,152,965.13
  5. Step 5: Solve for x
    x = 397,165,152,965.13/665,448.60
  6. Step 6: Final answer
    x = 596,838.21

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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.