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Finding the Fourth Proportional to 1,165.05, 1,608.18 and 772.20

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Solution

The fourth proportional to 1,165.05, 1,608.18 and 772.20 is: 1,065.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,165.05 : 1,608.18 = 772.20 : x
  2. Step 2: Convert to fraction form
    1,165.05/1,608.18 = 772.20/x
  3. Step 3: Cross multiply
    1,165.05x = 1,608.18 × 772.20
  4. Step 4: Simplify right side
    1,165.05x = 1,241,836.60
  5. Step 5: Solve for x
    x = 1,241,836.60/1,165.05
  6. Step 6: Final answer
    x = 1,065.91

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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.