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Finding the Fourth Proportional to 385,311.55, 531,708.54 and 215,512.87

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Solution

The fourth proportional to 385,311.55, 531,708.54 and 215,512.87 is: 297,395.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    385,311.55 : 531,708.54 = 215,512.87 : x
  2. Step 2: Convert to fraction form
    385,311.55/531,708.54 = 215,512.87/x
  3. Step 3: Cross multiply
    385,311.55x = 531,708.54 × 215,512.87
  4. Step 4: Simplify right side
    385,311.55x = 114,590,033,458.91
  5. Step 5: Solve for x
    x = 114,590,033,458.91/385,311.55
  6. Step 6: Final answer
    x = 297,395.79

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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.