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Finding the Fourth Proportional to 939.76, 1,296.72 and 608.20

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Solution

The fourth proportional to 939.76, 1,296.72 and 608.20 is: 839.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.76 : 1,296.72 = 608.20 : x
  2. Step 2: Convert to fraction form
    939.76/1,296.72 = 608.20/x
  3. Step 3: Cross multiply
    939.76x = 1,296.72 × 608.20
  4. Step 4: Simplify right side
    939.76x = 788,665.10
  5. Step 5: Solve for x
    x = 788,665.10/939.76
  6. Step 6: Final answer
    x = 839.22

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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.