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Finding the Fourth Proportional to 544.60, 815.86 and 428.76

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Solution

The fourth proportional to 544.60, 815.86 and 428.76 is: 642.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    544.60 : 815.86 = 428.76 : x
  2. Step 2: Convert to fraction form
    544.60/815.86 = 428.76/x
  3. Step 3: Cross multiply
    544.60x = 815.86 × 428.76
  4. Step 4: Simplify right side
    544.60x = 349,808.13
  5. Step 5: Solve for x
    x = 349,808.13/544.60
  6. Step 6: Final answer
    x = 642.32

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.