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Finding the Fourth Proportional to 393,879.48, 543,552.30 and 215,031.48

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Solution

The fourth proportional to 393,879.48, 543,552.30 and 215,031.48 is: 296,742.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,879.48 : 543,552.30 = 215,031.48 : x
  2. Step 2: Convert to fraction form
    393,879.48/543,552.30 = 215,031.48/x
  3. Step 3: Cross multiply
    393,879.48x = 543,552.30 × 215,031.48
  4. Step 4: Simplify right side
    393,879.48x = 116,880,855,526.40
  5. Step 5: Solve for x
    x = 116,880,855,526.40/393,879.48
  6. Step 6: Final answer
    x = 296,742.69

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.