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Finding the Fourth Proportional to 939.40, 1,296.10 and 608.02

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Solution

The fourth proportional to 939.40, 1,296.10 and 608.02 is: 838.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.40 : 1,296.10 = 608.02 : x
  2. Step 2: Convert to fraction form
    939.40/1,296.10 = 608.02/x
  3. Step 3: Cross multiply
    939.40x = 1,296.10 × 608.02
  4. Step 4: Simplify right side
    939.40x = 788,054.72
  5. Step 5: Solve for x
    x = 788,054.72/939.40
  6. Step 6: Final answer
    x = 838.89

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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.