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Finding the Fourth Proportional to 665,455.10, 996,870.45 and 398,422.40

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Solution

The fourth proportional to 665,455.10, 996,870.45 and 398,422.40 is: 596,847.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,455.10 : 996,870.45 = 398,422.40 : x
  2. Step 2: Convert to fraction form
    665,455.10/996,870.45 = 398,422.40/x
  3. Step 3: Cross multiply
    665,455.10x = 996,870.45 × 398,422.40
  4. Step 4: Simplify right side
    665,455.10x = 397,175,517,178.08
  5. Step 5: Solve for x
    x = 397,175,517,178.08/665,455.10
  6. Step 6: Final answer
    x = 596,847.96

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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.