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Finding the Fourth Proportional to 1,277.29, 1,762.55 and 717.71

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Solution

The fourth proportional to 1,277.29, 1,762.55 and 717.71 is: 990.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,277.29 : 1,762.55 = 717.71 : x
  2. Step 2: Convert to fraction form
    1,277.29/1,762.55 = 717.71/x
  3. Step 3: Cross multiply
    1,277.29x = 1,762.55 × 717.71
  4. Step 4: Simplify right side
    1,277.29x = 1,265,000.58
  5. Step 5: Solve for x
    x = 1,265,000.58/1,277.29
  6. Step 6: Final answer
    x = 990.38

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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.