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Finding the Fourth Proportional to 1,530.75, 2,112.63 and 909.75

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Solution

The fourth proportional to 1,530.75, 2,112.63 and 909.75 is: 1,255.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,530.75 : 2,112.63 = 909.75 : x
  2. Step 2: Convert to fraction form
    1,530.75/2,112.63 = 909.75/x
  3. Step 3: Cross multiply
    1,530.75x = 2,112.63 × 909.75
  4. Step 4: Simplify right side
    1,530.75x = 1,921,965.14
  5. Step 5: Solve for x
    x = 1,921,965.14/1,530.75
  6. Step 6: Final answer
    x = 1,255.57

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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.