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Finding the Fourth Proportional to 939.76, 1,296.78 and 520.10

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Solution

The fourth proportional to 939.76, 1,296.78 and 520.10 is: 717.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.76 : 1,296.78 = 520.10 : x
  2. Step 2: Convert to fraction form
    939.76/1,296.78 = 520.10/x
  3. Step 3: Cross multiply
    939.76x = 1,296.78 × 520.10
  4. Step 4: Simplify right side
    939.76x = 674,459.82
  5. Step 5: Solve for x
    x = 674,459.82/939.76
  6. Step 6: Final answer
    x = 717.70

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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.