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Finding the Fourth Proportional to 939.16, 1,296.30 and 645.16

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Solution

The fourth proportional to 939.16, 1,296.30 and 645.16 is: 890.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.16 : 1,296.30 = 645.16 : x
  2. Step 2: Convert to fraction form
    939.16/1,296.30 = 645.16/x
  3. Step 3: Cross multiply
    939.16x = 1,296.30 × 645.16
  4. Step 4: Simplify right side
    939.16x = 836,320.91
  5. Step 5: Solve for x
    x = 836,320.91/939.16
  6. Step 6: Final answer
    x = 890.50

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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.