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Finding the Fourth Proportional to 1,276.22, 1,759.65 and 992.72

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Solution

The fourth proportional to 1,276.22, 1,759.65 and 992.72 is: 1,368.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,276.22 : 1,759.65 = 992.72 : x
  2. Step 2: Convert to fraction form
    1,276.22/1,759.65 = 992.72/x
  3. Step 3: Cross multiply
    1,276.22x = 1,759.65 × 992.72
  4. Step 4: Simplify right side
    1,276.22x = 1,746,839.75
  5. Step 5: Solve for x
    x = 1,746,839.75/1,276.22
  6. Step 6: Final answer
    x = 1,368.76

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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.