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Finding the Fourth Proportional to 399,116.80, 598,966.80 and 281,018.80

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Solution

The fourth proportional to 399,116.80, 598,966.80 and 281,018.80 is: 421,733.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,116.80 : 598,966.80 = 281,018.80 : x
  2. Step 2: Convert to fraction form
    399,116.80/598,966.80 = 281,018.80/x
  3. Step 3: Cross multiply
    399,116.80x = 598,966.80 × 281,018.80
  4. Step 4: Simplify right side
    399,116.80x = 168,320,931,375.84
  5. Step 5: Solve for x
    x = 168,320,931,375.84/399,116.80
  6. Step 6: Final answer
    x = 421,733.52

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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.