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Finding the Fourth Proportional to 1,242.76, 1,715.22 and 776.80

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Solution

The fourth proportional to 1,242.76, 1,715.22 and 776.80 is: 1,072.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,242.76 : 1,715.22 = 776.80 : x
  2. Step 2: Convert to fraction form
    1,242.76/1,715.22 = 776.80/x
  3. Step 3: Cross multiply
    1,242.76x = 1,715.22 × 776.80
  4. Step 4: Simplify right side
    1,242.76x = 1,332,382.90
  5. Step 5: Solve for x
    x = 1,332,382.90/1,242.76
  6. Step 6: Final answer
    x = 1,072.12

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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.