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Finding the Fourth Proportional to 777.80, 1,073.36 and 428.48

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Solution

The fourth proportional to 777.80, 1,073.36 and 428.48 is: 591.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.80 : 1,073.36 = 428.48 : x
  2. Step 2: Convert to fraction form
    777.80/1,073.36 = 428.48/x
  3. Step 3: Cross multiply
    777.80x = 1,073.36 × 428.48
  4. Step 4: Simplify right side
    777.80x = 459,913.29
  5. Step 5: Solve for x
    x = 459,913.29/777.80
  6. Step 6: Final answer
    x = 591.30

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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.