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Finding the Fourth Proportional to 571.53, 788.76 and 478.11

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Solution

The fourth proportional to 571.53, 788.76 and 478.11 is: 659.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    571.53 : 788.76 = 478.11 : x
  2. Step 2: Convert to fraction form
    571.53/788.76 = 478.11/x
  3. Step 3: Cross multiply
    571.53x = 788.76 × 478.11
  4. Step 4: Simplify right side
    571.53x = 377,114.04
  5. Step 5: Solve for x
    x = 377,114.04/571.53
  6. Step 6: Final answer
    x = 659.83

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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.