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Finding the Fourth Proportional to 1,089.68, 1,503.78 and 853.92

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Solution

The fourth proportional to 1,089.68, 1,503.78 and 853.92 is: 1,178.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,089.68 : 1,503.78 = 853.92 : x
  2. Step 2: Convert to fraction form
    1,089.68/1,503.78 = 853.92/x
  3. Step 3: Cross multiply
    1,089.68x = 1,503.78 × 853.92
  4. Step 4: Simplify right side
    1,089.68x = 1,284,107.82
  5. Step 5: Solve for x
    x = 1,284,107.82/1,089.68
  6. Step 6: Final answer
    x = 1,178.43

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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.