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Finding the Fourth Proportional to 770.68, 1,155.84 and 380.28

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Solution

The fourth proportional to 770.68, 1,155.84 and 380.28 is: 570.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    770.68 : 1,155.84 = 380.28 : x
  2. Step 2: Convert to fraction form
    770.68/1,155.84 = 380.28/x
  3. Step 3: Cross multiply
    770.68x = 1,155.84 × 380.28
  4. Step 4: Simplify right side
    770.68x = 439,542.84
  5. Step 5: Solve for x
    x = 439,542.84/770.68
  6. Step 6: Final answer
    x = 570.33

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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.