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Finding the Fourth Proportional to 1,274.14, 1,909.86 and 810.46

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Solution

The fourth proportional to 1,274.14, 1,909.86 and 810.46 is: 1,214.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,274.14 : 1,909.86 = 810.46 : x
  2. Step 2: Convert to fraction form
    1,274.14/1,909.86 = 810.46/x
  3. Step 3: Cross multiply
    1,274.14x = 1,909.86 × 810.46
  4. Step 4: Simplify right side
    1,274.14x = 1,547,865.14
  5. Step 5: Solve for x
    x = 1,547,865.14/1,274.14
  6. Step 6: Final answer
    x = 1,214.83

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.