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Finding the Fourth Proportional to 572.78, 790.72 and 351.86

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Solution

The fourth proportional to 572.78, 790.72 and 351.86 is: 485.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    572.78 : 790.72 = 351.86 : x
  2. Step 2: Convert to fraction form
    572.78/790.72 = 351.86/x
  3. Step 3: Cross multiply
    572.78x = 790.72 × 351.86
  4. Step 4: Simplify right side
    572.78x = 278,222.74
  5. Step 5: Solve for x
    x = 278,222.74/572.78
  6. Step 6: Final answer
    x = 485.74

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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.