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Finding the Fourth Proportional to 770.83, 1,156.50 and 511.85

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Solution

The fourth proportional to 770.83, 1,156.50 and 511.85 is: 767.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    770.83 : 1,156.50 = 511.85 : x
  2. Step 2: Convert to fraction form
    770.83/1,156.50 = 511.85/x
  3. Step 3: Cross multiply
    770.83x = 1,156.50 × 511.85
  4. Step 4: Simplify right side
    770.83x = 591,959.06
  5. Step 5: Solve for x
    x = 591,959.06/770.83
  6. Step 6: Final answer
    x = 767.95

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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.