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Finding the Fourth Proportional to 428.90, 591.78 and 263.05

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Solution

The fourth proportional to 428.90, 591.78 and 263.05 is: 362.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.90 : 591.78 = 263.05 : x
  2. Step 2: Convert to fraction form
    428.90/591.78 = 263.05/x
  3. Step 3: Cross multiply
    428.90x = 591.78 × 263.05
  4. Step 4: Simplify right side
    428.90x = 155,666.50
  5. Step 5: Solve for x
    x = 155,666.50/428.90
  6. Step 6: Final answer
    x = 362.95

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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.