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Finding the Fourth Proportional to 907.74, 1,358.94 and 813.96

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Solution

The fourth proportional to 907.74, 1,358.94 and 813.96 is: 1,218.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    907.74 : 1,358.94 = 813.96 : x
  2. Step 2: Convert to fraction form
    907.74/1,358.94 = 813.96/x
  3. Step 3: Cross multiply
    907.74x = 1,358.94 × 813.96
  4. Step 4: Simplify right side
    907.74x = 1,106,122.80
  5. Step 5: Solve for x
    x = 1,106,122.80/907.74
  6. Step 6: Final answer
    x = 1,218.55

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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.