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Finding the Fourth Proportional to 388,187.72, 535,909.32 and 272,257.21

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Solution

The fourth proportional to 388,187.72, 535,909.32 and 272,257.21 is: 375,862.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,187.72 : 535,909.32 = 272,257.21 : x
  2. Step 2: Convert to fraction form
    388,187.72/535,909.32 = 272,257.21/x
  3. Step 3: Cross multiply
    388,187.72x = 535,909.32 × 272,257.21
  4. Step 4: Simplify right side
    388,187.72x = 145,905,174,936.42
  5. Step 5: Solve for x
    x = 145,905,174,936.42/388,187.72
  6. Step 6: Final answer
    x = 375,862.42

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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.