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Finding the Fourth Proportional to 387.76, 535.26 and 256.72

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Solution

The fourth proportional to 387.76, 535.26 and 256.72 is: 354.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.76 : 535.26 = 256.72 : x
  2. Step 2: Convert to fraction form
    387.76/535.26 = 256.72/x
  3. Step 3: Cross multiply
    387.76x = 535.26 × 256.72
  4. Step 4: Simplify right side
    387.76x = 137,411.95
  5. Step 5: Solve for x
    x = 137,411.95/387.76
  6. Step 6: Final answer
    x = 354.37

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.