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Finding the Fourth Proportional to 1,287.48, 1,776.74 and 756.26

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Solution

The fourth proportional to 1,287.48, 1,776.74 and 756.26 is: 1,043.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287.48 : 1,776.74 = 756.26 : x
  2. Step 2: Convert to fraction form
    1,287.48/1,776.74 = 756.26/x
  3. Step 3: Cross multiply
    1,287.48x = 1,776.74 × 756.26
  4. Step 4: Simplify right side
    1,287.48x = 1,343,664.73
  5. Step 5: Solve for x
    x = 1,343,664.73/1,287.48
  6. Step 6: Final answer
    x = 1,043.64

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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.