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Finding the Fourth Proportional to 765.11, 1,055.78 and 428.98

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Solution

The fourth proportional to 765.11, 1,055.78 and 428.98 is: 591.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.11 : 1,055.78 = 428.98 : x
  2. Step 2: Convert to fraction form
    765.11/1,055.78 = 428.98/x
  3. Step 3: Cross multiply
    765.11x = 1,055.78 × 428.98
  4. Step 4: Simplify right side
    765.11x = 452,908.50
  5. Step 5: Solve for x
    x = 452,908.50/765.11
  6. Step 6: Final answer
    x = 591.95

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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.