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Finding the Fourth Proportional to 1,278.34, 1,763.66 and 836.50

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Solution

The fourth proportional to 1,278.34, 1,763.66 and 836.50 is: 1,154.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.34 : 1,763.66 = 836.50 : x
  2. Step 2: Convert to fraction form
    1,278.34/1,763.66 = 836.50/x
  3. Step 3: Cross multiply
    1,278.34x = 1,763.66 × 836.50
  4. Step 4: Simplify right side
    1,278.34x = 1,475,301.59
  5. Step 5: Solve for x
    x = 1,475,301.59/1,278.34
  6. Step 6: Final answer
    x = 1,154.08

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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.