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Finding the Fourth Proportional to 1,425.92, 2,139.68 and 776.70

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Solution

The fourth proportional to 1,425.92, 2,139.68 and 776.70 is: 1,165.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,425.92 : 2,139.68 = 776.70 : x
  2. Step 2: Convert to fraction form
    1,425.92/2,139.68 = 776.70/x
  3. Step 3: Cross multiply
    1,425.92x = 2,139.68 × 776.70
  4. Step 4: Simplify right side
    1,425.92x = 1,661,889.46
  5. Step 5: Solve for x
    x = 1,661,889.46/1,425.92
  6. Step 6: Final answer
    x = 1,165.49

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.