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Finding the Fourth Proportional to 784.74, 1,083.20 and 453.25

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Solution

The fourth proportional to 784.74, 1,083.20 and 453.25 is: 625.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.74 : 1,083.20 = 453.25 : x
  2. Step 2: Convert to fraction form
    784.74/1,083.20 = 453.25/x
  3. Step 3: Cross multiply
    784.74x = 1,083.20 × 453.25
  4. Step 4: Simplify right side
    784.74x = 490,960.40
  5. Step 5: Solve for x
    x = 490,960.40/784.74
  6. Step 6: Final answer
    x = 625.63

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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.