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Finding the Fourth Proportional to 1,009.50, 1,392.55 and 853.07

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Solution

The fourth proportional to 1,009.50, 1,392.55 and 853.07 is: 1,176.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,009.50 : 1,392.55 = 853.07 : x
  2. Step 2: Convert to fraction form
    1,009.50/1,392.55 = 853.07/x
  3. Step 3: Cross multiply
    1,009.50x = 1,392.55 × 853.07
  4. Step 4: Simplify right side
    1,009.50x = 1,187,942.63
  5. Step 5: Solve for x
    x = 1,187,942.63/1,009.50
  6. Step 6: Final answer
    x = 1,176.76

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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.