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Finding the Fourth Proportional to 897.86, 1,238.78 and 543.92

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Solution

The fourth proportional to 897.86, 1,238.78 and 543.92 is: 750.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    897.86 : 1,238.78 = 543.92 : x
  2. Step 2: Convert to fraction form
    897.86/1,238.78 = 543.92/x
  3. Step 3: Cross multiply
    897.86x = 1,238.78 × 543.92
  4. Step 4: Simplify right side
    897.86x = 673,792.38
  5. Step 5: Solve for x
    x = 673,792.38/897.86
  6. Step 6: Final answer
    x = 750.44

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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.