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Finding the Fourth Proportional to 1,184.64, 1,635.76 and 765.20

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Solution

The fourth proportional to 1,184.64, 1,635.76 and 765.20 is: 1,056.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,184.64 : 1,635.76 = 765.20 : x
  2. Step 2: Convert to fraction form
    1,184.64/1,635.76 = 765.20/x
  3. Step 3: Cross multiply
    1,184.64x = 1,635.76 × 765.20
  4. Step 4: Simplify right side
    1,184.64x = 1,251,683.55
  5. Step 5: Solve for x
    x = 1,251,683.55/1,184.64
  6. Step 6: Final answer
    x = 1,056.59

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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.