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Finding the Fourth Proportional to 768.77, 1,150.70 and 612.95

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Solution

The fourth proportional to 768.77, 1,150.70 and 612.95 is: 917.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.77 : 1,150.70 = 612.95 : x
  2. Step 2: Convert to fraction form
    768.77/1,150.70 = 612.95/x
  3. Step 3: Cross multiply
    768.77x = 1,150.70 × 612.95
  4. Step 4: Simplify right side
    768.77x = 705,312.75
  5. Step 5: Solve for x
    x = 705,312.75/768.77
  6. Step 6: Final answer
    x = 917.46

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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.