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Finding the Fourth Proportional to 1,068.78, 1,602.76 and 513.39

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Solution

The fourth proportional to 1,068.78, 1,602.76 and 513.39 is: 769.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,068.78 : 1,602.76 = 513.39 : x
  2. Step 2: Convert to fraction form
    1,068.78/1,602.76 = 513.39/x
  3. Step 3: Cross multiply
    1,068.78x = 1,602.76 × 513.39
  4. Step 4: Simplify right side
    1,068.78x = 822,840.96
  5. Step 5: Solve for x
    x = 822,840.96/1,068.78
  6. Step 6: Final answer
    x = 769.89

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.