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Finding the Fourth Proportional to 665,045.40, 996,984.90 and 398,911.80

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Solution

The fourth proportional to 665,045.40, 996,984.90 and 398,911.80 is: 598,017.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,045.40 : 996,984.90 = 398,911.80 : x
  2. Step 2: Convert to fraction form
    665,045.40/996,984.90 = 398,911.80/x
  3. Step 3: Cross multiply
    665,045.40x = 996,984.90 × 398,911.80
  4. Step 4: Simplify right side
    665,045.40x = 397,709,041,031.82
  5. Step 5: Solve for x
    x = 397,709,041,031.82/665,045.40
  6. Step 6: Final answer
    x = 598,017.88

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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.