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Finding the Fourth Proportional to 527.30, 789.39 and 390.95

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Solution

The fourth proportional to 527.30, 789.39 and 390.95 is: 585.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    527.30 : 789.39 = 390.95 : x
  2. Step 2: Convert to fraction form
    527.30/789.39 = 390.95/x
  3. Step 3: Cross multiply
    527.30x = 789.39 × 390.95
  4. Step 4: Simplify right side
    527.30x = 308,612.02
  5. Step 5: Solve for x
    x = 308,612.02/527.30
  6. Step 6: Final answer
    x = 585.27

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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.