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Finding the Fourth Proportional to 377.76, 521.40 and 302.78

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Solution

The fourth proportional to 377.76, 521.40 and 302.78 is: 417.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    377.76 : 521.40 = 302.78 : x
  2. Step 2: Convert to fraction form
    377.76/521.40 = 302.78/x
  3. Step 3: Cross multiply
    377.76x = 521.40 × 302.78
  4. Step 4: Simplify right side
    377.76x = 157,866.89
  5. Step 5: Solve for x
    x = 157,866.89/377.76
  6. Step 6: Final answer
    x = 417.90

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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.