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Finding the Fourth Proportional to 428.58, 589.95 and 365.40

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Solution

The fourth proportional to 428.58, 589.95 and 365.40 is: 502.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.58 : 589.95 = 365.40 : x
  2. Step 2: Convert to fraction form
    428.58/589.95 = 365.40/x
  3. Step 3: Cross multiply
    428.58x = 589.95 × 365.40
  4. Step 4: Simplify right side
    428.58x = 215,567.73
  5. Step 5: Solve for x
    x = 215,567.73/428.58
  6. Step 6: Final answer
    x = 502.98

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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.