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Finding the Fourth Proportional to 764.77, 1,055.43 and 428.70

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Solution

The fourth proportional to 764.77, 1,055.43 and 428.70 is: 591.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.77 : 1,055.43 = 428.70 : x
  2. Step 2: Convert to fraction form
    764.77/1,055.43 = 428.70/x
  3. Step 3: Cross multiply
    764.77x = 1,055.43 × 428.70
  4. Step 4: Simplify right side
    764.77x = 452,462.84
  5. Step 5: Solve for x
    x = 452,462.84/764.77
  6. Step 6: Final answer
    x = 591.63

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.