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Finding the Fourth Proportional to 572.90, 790.90 and 387.36

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Solution

The fourth proportional to 572.90, 790.90 and 387.36 is: 534.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    572.90 : 790.90 = 387.36 : x
  2. Step 2: Convert to fraction form
    572.90/790.90 = 387.36/x
  3. Step 3: Cross multiply
    572.90x = 790.90 × 387.36
  4. Step 4: Simplify right side
    572.90x = 306,363.02
  5. Step 5: Solve for x
    x = 306,363.02/572.90
  6. Step 6: Final answer
    x = 534.76

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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.