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Finding the Fourth Proportional to 770.82, 1,155.12 and 578.58

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Solution

The fourth proportional to 770.82, 1,155.12 and 578.58 is: 867.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    770.82 : 1,155.12 = 578.58 : x
  2. Step 2: Convert to fraction form
    770.82/1,155.12 = 578.58/x
  3. Step 3: Cross multiply
    770.82x = 1,155.12 × 578.58
  4. Step 4: Simplify right side
    770.82x = 668,329.33
  5. Step 5: Solve for x
    x = 668,329.33/770.82
  6. Step 6: Final answer
    x = 867.04

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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.