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Finding the Fourth Proportional to 1,425.12, 1,966.68 and 804.12

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Solution

The fourth proportional to 1,425.12, 1,966.68 and 804.12 is: 1,109.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,425.12 : 1,966.68 = 804.12 : x
  2. Step 2: Convert to fraction form
    1,425.12/1,966.68 = 804.12/x
  3. Step 3: Cross multiply
    1,425.12x = 1,966.68 × 804.12
  4. Step 4: Simplify right side
    1,425.12x = 1,581,446.72
  5. Step 5: Solve for x
    x = 1,581,446.72/1,425.12
  6. Step 6: Final answer
    x = 1,109.69

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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.