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Finding the Fourth Proportional to 385,308.55, 531,704.41 and 215,509.87

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Solution

The fourth proportional to 385,308.55, 531,704.41 and 215,509.87 is: 297,391.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    385,308.55 : 531,704.41 = 215,509.87 : x
  2. Step 2: Convert to fraction form
    385,308.55/531,704.41 = 215,509.87/x
  3. Step 3: Cross multiply
    385,308.55x = 531,704.41 × 215,509.87
  4. Step 4: Simplify right side
    385,308.55x = 114,587,548,277.53
  5. Step 5: Solve for x
    x = 114,587,548,277.53/385,308.55
  6. Step 6: Final answer
    x = 297,391.66

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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.