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Finding the Fourth Proportional to 784.53, 1,080.99 and 644.18

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Solution

The fourth proportional to 784.53, 1,080.99 and 644.18 is: 887.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.53 : 1,080.99 = 644.18 : x
  2. Step 2: Convert to fraction form
    784.53/1,080.99 = 644.18/x
  3. Step 3: Cross multiply
    784.53x = 1,080.99 × 644.18
  4. Step 4: Simplify right side
    784.53x = 696,346.73
  5. Step 5: Solve for x
    x = 696,346.73/784.53
  6. Step 6: Final answer
    x = 887.60

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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.