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Finding the Fourth Proportional to 1,288.90, 1,934.09 and 770.16

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Solution

The fourth proportional to 1,288.90, 1,934.09 and 770.16 is: 1,155.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,288.90 : 1,934.09 = 770.16 : x
  2. Step 2: Convert to fraction form
    1,288.90/1,934.09 = 770.16/x
  3. Step 3: Cross multiply
    1,288.90x = 1,934.09 × 770.16
  4. Step 4: Simplify right side
    1,288.90x = 1,489,558.75
  5. Step 5: Solve for x
    x = 1,489,558.75/1,288.90
  6. Step 6: Final answer
    x = 1,155.68

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1.5x scale

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.