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Finding the Fourth Proportional to 784.64, 1,082.80 and 453.04

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Solution

The fourth proportional to 784.64, 1,082.80 and 453.04 is: 625.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.64 : 1,082.80 = 453.04 : x
  2. Step 2: Convert to fraction form
    784.64/1,082.80 = 453.04/x
  3. Step 3: Cross multiply
    784.64x = 1,082.80 × 453.04
  4. Step 4: Simplify right side
    784.64x = 490,551.71
  5. Step 5: Solve for x
    x = 490,551.71/784.64
  6. Step 6: Final answer
    x = 625.19

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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.