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Finding the Fourth Proportional to 980.56, 1,470.86 and 433.15

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Solution

The fourth proportional to 980.56, 1,470.86 and 433.15 is: 649.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.56 : 1,470.86 = 433.15 : x
  2. Step 2: Convert to fraction form
    980.56/1,470.86 = 433.15/x
  3. Step 3: Cross multiply
    980.56x = 1,470.86 × 433.15
  4. Step 4: Simplify right side
    980.56x = 637,098.79
  5. Step 5: Solve for x
    x = 637,098.79/980.56
  6. Step 6: Final answer
    x = 649.73

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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.