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Finding the Fourth Proportional to 572.81, 790.46 and 320.70

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Solution

The fourth proportional to 572.81, 790.46 and 320.70 is: 442.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    572.81 : 790.46 = 320.70 : x
  2. Step 2: Convert to fraction form
    572.81/790.46 = 320.70/x
  3. Step 3: Cross multiply
    572.81x = 790.46 × 320.70
  4. Step 4: Simplify right side
    572.81x = 253,498.92
  5. Step 5: Solve for x
    x = 253,498.92/572.81
  6. Step 6: Final answer
    x = 442.56

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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.