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Finding the Fourth Proportional to 430.20, 645.98 and 247.95

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Solution

The fourth proportional to 430.20, 645.98 and 247.95 is: 372.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    430.20 : 645.98 = 247.95 : x
  2. Step 2: Convert to fraction form
    430.20/645.98 = 247.95/x
  3. Step 3: Cross multiply
    430.20x = 645.98 × 247.95
  4. Step 4: Simplify right side
    430.20x = 160,169.50
  5. Step 5: Solve for x
    x = 160,169.50/430.20
  6. Step 6: Final answer
    x = 372.31

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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.