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Finding the Fourth Proportional to 1,009.70, 1,389.59 and 854.38

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Solution

The fourth proportional to 1,009.70, 1,389.59 and 854.38 is: 1,175.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,009.70 : 1,389.59 = 854.38 : x
  2. Step 2: Convert to fraction form
    1,009.70/1,389.59 = 854.38/x
  3. Step 3: Cross multiply
    1,009.70x = 1,389.59 × 854.38
  4. Step 4: Simplify right side
    1,009.70x = 1,187,230.96
  5. Step 5: Solve for x
    x = 1,187,230.96/1,009.70
  6. Step 6: Final answer
    x = 1,175.83

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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.