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Finding the Fourth Proportional to 777.02, 1,072.47 and 528.44

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Solution

The fourth proportional to 777.02, 1,072.47 and 528.44 is: 729.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.02 : 1,072.47 = 528.44 : x
  2. Step 2: Convert to fraction form
    777.02/1,072.47 = 528.44/x
  3. Step 3: Cross multiply
    777.02x = 1,072.47 × 528.44
  4. Step 4: Simplify right side
    777.02x = 566,733.40
  5. Step 5: Solve for x
    x = 566,733.40/777.02
  6. Step 6: Final answer
    x = 729.37

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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.