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Finding the Fourth Proportional to 939.39, 1,295.76 and 590.28

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Solution

The fourth proportional to 939.39, 1,295.76 and 590.28 is: 814.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.39 : 1,295.76 = 590.28 : x
  2. Step 2: Convert to fraction form
    939.39/1,295.76 = 590.28/x
  3. Step 3: Cross multiply
    939.39x = 1,295.76 × 590.28
  4. Step 4: Simplify right side
    939.39x = 764,861.21
  5. Step 5: Solve for x
    x = 764,861.21/939.39
  6. Step 6: Final answer
    x = 814.21

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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.