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Finding the Fourth Proportional to 572.40, 790.20 and 478.80

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Solution

The fourth proportional to 572.40, 790.20 and 478.80 is: 660.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    572.40 : 790.20 = 478.80 : x
  2. Step 2: Convert to fraction form
    572.40/790.20 = 478.80/x
  3. Step 3: Cross multiply
    572.40x = 790.20 × 478.80
  4. Step 4: Simplify right side
    572.40x = 378,347.76
  5. Step 5: Solve for x
    x = 378,347.76/572.40
  6. Step 6: Final answer
    x = 660.98

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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.