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Finding the Fourth Proportional to 1,139.39, 1,710.30 and 909.75

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Solution

The fourth proportional to 1,139.39, 1,710.30 and 909.75 is: 1,365.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.39 : 1,710.30 = 909.75 : x
  2. Step 2: Convert to fraction form
    1,139.39/1,710.30 = 909.75/x
  3. Step 3: Cross multiply
    1,139.39x = 1,710.30 × 909.75
  4. Step 4: Simplify right side
    1,139.39x = 1,555,945.43
  5. Step 5: Solve for x
    x = 1,555,945.43/1,139.39
  6. Step 6: Final answer
    x = 1,365.60

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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.