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Finding the Fourth Proportional to 399,085.80, 598,920.30 and 280,987.80

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Solution

The fourth proportional to 399,085.80, 598,920.30 and 280,987.80 is: 421,687.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,085.80 : 598,920.30 = 280,987.80 : x
  2. Step 2: Convert to fraction form
    399,085.80/598,920.30 = 280,987.80/x
  3. Step 3: Cross multiply
    399,085.80x = 598,920.30 × 280,987.80
  4. Step 4: Simplify right side
    399,085.80x = 168,289,297,472.34
  5. Step 5: Solve for x
    x = 168,289,297,472.34/399,085.80
  6. Step 6: Final answer
    x = 421,687.01

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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.