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Finding the Fourth Proportional to 1,277.43, 1,762.90 and 717.89

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Solution

The fourth proportional to 1,277.43, 1,762.90 and 717.89 is: 990.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,277.43 : 1,762.90 = 717.89 : x
  2. Step 2: Convert to fraction form
    1,277.43/1,762.90 = 717.89/x
  3. Step 3: Cross multiply
    1,277.43x = 1,762.90 × 717.89
  4. Step 4: Simplify right side
    1,277.43x = 1,265,557.67
  5. Step 5: Solve for x
    x = 1,265,557.67/1,277.43
  6. Step 6: Final answer
    x = 990.71

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1.5x scale

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.