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Finding the Fourth Proportional to 770.76, 1,155.45 and 360.39

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Solution

The fourth proportional to 770.76, 1,155.45 and 360.39 is: 540.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    770.76 : 1,155.45 = 360.39 : x
  2. Step 2: Convert to fraction form
    770.76/1,155.45 = 360.39/x
  3. Step 3: Cross multiply
    770.76x = 1,155.45 × 360.39
  4. Step 4: Simplify right side
    770.76x = 416,412.63
  5. Step 5: Solve for x
    x = 416,412.63/770.76
  6. Step 6: Final answer
    x = 540.27

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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.