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Finding the Fourth Proportional to 572.94, 790.17 and 386.40

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Solution

The fourth proportional to 572.94, 790.17 and 386.40 is: 532.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    572.94 : 790.17 = 386.40 : x
  2. Step 2: Convert to fraction form
    572.94/790.17 = 386.40/x
  3. Step 3: Cross multiply
    572.94x = 790.17 × 386.40
  4. Step 4: Simplify right side
    572.94x = 305,321.69
  5. Step 5: Solve for x
    x = 305,321.69/572.94
  6. Step 6: Final answer
    x = 532.90

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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.