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Finding the Fourth Proportional to 377.84, 520.56 and 312.72

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Solution

The fourth proportional to 377.84, 520.56 and 312.72 is: 430.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    377.84 : 520.56 = 312.72 : x
  2. Step 2: Convert to fraction form
    377.84/520.56 = 312.72/x
  3. Step 3: Cross multiply
    377.84x = 520.56 × 312.72
  4. Step 4: Simplify right side
    377.84x = 162,789.52
  5. Step 5: Solve for x
    x = 162,789.52/377.84
  6. Step 6: Final answer
    x = 430.84

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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.