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Finding the Fourth Proportional to 770.10, 1,155.30 and 331.35

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Solution

The fourth proportional to 770.10, 1,155.30 and 331.35 is: 497.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    770.10 : 1,155.30 = 331.35 : x
  2. Step 2: Convert to fraction form
    770.10/1,155.30 = 331.35/x
  3. Step 3: Cross multiply
    770.10x = 1,155.30 × 331.35
  4. Step 4: Simplify right side
    770.10x = 382,808.66
  5. Step 5: Solve for x
    x = 382,808.66/770.10
  6. Step 6: Final answer
    x = 497.09

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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.