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Finding the Fourth Proportional to 1,116.53, 1,674.45 and 772.08

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Solution

The fourth proportional to 1,116.53, 1,674.45 and 772.08 is: 1,157.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,116.53 : 1,674.45 = 772.08 : x
  2. Step 2: Convert to fraction form
    1,116.53/1,674.45 = 772.08/x
  3. Step 3: Cross multiply
    1,116.53x = 1,674.45 × 772.08
  4. Step 4: Simplify right side
    1,116.53x = 1,292,809.36
  5. Step 5: Solve for x
    x = 1,292,809.36/1,116.53
  6. Step 6: Final answer
    x = 1,157.88

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.