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Finding the Fourth Proportional to 1,113.80, 1,665.84 and 909.68

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Solution

The fourth proportional to 1,113.80, 1,665.84 and 909.68 is: 1,360.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,113.80 : 1,665.84 = 909.68 : x
  2. Step 2: Convert to fraction form
    1,113.80/1,665.84 = 909.68/x
  3. Step 3: Cross multiply
    1,113.80x = 1,665.84 × 909.68
  4. Step 4: Simplify right side
    1,113.80x = 1,515,381.33
  5. Step 5: Solve for x
    x = 1,515,381.33/1,113.80
  6. Step 6: Final answer
    x = 1,360.55

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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.