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Finding the Fourth Proportional to 980.02, 1,470.03 and 431.43

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Solution

The fourth proportional to 980.02, 1,470.03 and 431.43 is: 647.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.02 : 1,470.03 = 431.43 : x
  2. Step 2: Convert to fraction form
    980.02/1,470.03 = 431.43/x
  3. Step 3: Cross multiply
    980.02x = 1,470.03 × 431.43
  4. Step 4: Simplify right side
    980.02x = 634,215.04
  5. Step 5: Solve for x
    x = 634,215.04/980.02
  6. Step 6: Final answer
    x = 647.15

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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.