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Finding the Fourth Proportional to 1,308.80, 1,805.68 and 784.64

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Solution

The fourth proportional to 1,308.80, 1,805.68 and 784.64 is: 1,082.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,308.80 : 1,805.68 = 784.64 : x
  2. Step 2: Convert to fraction form
    1,308.80/1,805.68 = 784.64/x
  3. Step 3: Cross multiply
    1,308.80x = 1,805.68 × 784.64
  4. Step 4: Simplify right side
    1,308.80x = 1,416,808.76
  5. Step 5: Solve for x
    x = 1,416,808.76/1,308.80
  6. Step 6: Final answer
    x = 1,082.53

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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.