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Finding the Fourth Proportional to 783.05, 1,080.60 and 428.98

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Solution

The fourth proportional to 783.05, 1,080.60 and 428.98 is: 591.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.05 : 1,080.60 = 428.98 : x
  2. Step 2: Convert to fraction form
    783.05/1,080.60 = 428.98/x
  3. Step 3: Cross multiply
    783.05x = 1,080.60 × 428.98
  4. Step 4: Simplify right side
    783.05x = 463,555.79
  5. Step 5: Solve for x
    x = 463,555.79/783.05
  6. Step 6: Final answer
    x = 591.99

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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.