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Finding the Fourth Proportional to 1,106.43, 1,655.79 and 909.06

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Solution

The fourth proportional to 1,106.43, 1,655.79 and 909.06 is: 1,360.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,106.43 : 1,655.79 = 909.06 : x
  2. Step 2: Convert to fraction form
    1,106.43/1,655.79 = 909.06/x
  3. Step 3: Cross multiply
    1,106.43x = 1,655.79 × 909.06
  4. Step 4: Simplify right side
    1,106.43x = 1,505,212.46
  5. Step 5: Solve for x
    x = 1,505,212.46/1,106.43
  6. Step 6: Final answer
    x = 1,360.42

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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.