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Finding the Fourth Proportional to 1,277.69, 1,763.25 and 718.21

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Solution

The fourth proportional to 1,277.69, 1,763.25 and 718.21 is: 991.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,277.69 : 1,763.25 = 718.21 : x
  2. Step 2: Convert to fraction form
    1,277.69/1,763.25 = 718.21/x
  3. Step 3: Cross multiply
    1,277.69x = 1,763.25 × 718.21
  4. Step 4: Simplify right side
    1,277.69x = 1,266,388.19
  5. Step 5: Solve for x
    x = 1,266,388.19/1,277.69
  6. Step 6: Final answer
    x = 991.15

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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.