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Finding the Fourth Proportional to 784.80, 1,083.16 and 453.17

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Solution

The fourth proportional to 784.80, 1,083.16 and 453.17 is: 625.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.80 : 1,083.16 = 453.17 : x
  2. Step 2: Convert to fraction form
    784.80/1,083.16 = 453.17/x
  3. Step 3: Cross multiply
    784.80x = 1,083.16 × 453.17
  4. Step 4: Simplify right side
    784.80x = 490,855.62
  5. Step 5: Solve for x
    x = 490,855.62/784.80
  6. Step 6: Final answer
    x = 625.45

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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.