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Finding the Fourth Proportional to 764.79, 1,055.39 and 428.67

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Solution

The fourth proportional to 764.79, 1,055.39 and 428.67 is: 591.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.79 : 1,055.39 = 428.67 : x
  2. Step 2: Convert to fraction form
    764.79/1,055.39 = 428.67/x
  3. Step 3: Cross multiply
    764.79x = 1,055.39 × 428.67
  4. Step 4: Simplify right side
    764.79x = 452,415.10
  5. Step 5: Solve for x
    x = 452,415.10/764.79
  6. Step 6: Final answer
    x = 591.55

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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.