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Finding the Fourth Proportional to 680.90, 939.78 and 432.02

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Solution

The fourth proportional to 680.90, 939.78 and 432.02 is: 596.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.90 : 939.78 = 432.02 : x
  2. Step 2: Convert to fraction form
    680.90/939.78 = 432.02/x
  3. Step 3: Cross multiply
    680.90x = 939.78 × 432.02
  4. Step 4: Simplify right side
    680.90x = 405,999.06
  5. Step 5: Solve for x
    x = 405,999.06/680.90
  6. Step 6: Final answer
    x = 596.27

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1.5x scale

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.