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Finding the Fourth Proportional to 739.90, 1,020.60 and 529.78

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Solution

The fourth proportional to 739.90, 1,020.60 and 529.78 is: 730.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    739.90 : 1,020.60 = 529.78 : x
  2. Step 2: Convert to fraction form
    739.90/1,020.60 = 529.78/x
  3. Step 3: Cross multiply
    739.90x = 1,020.60 × 529.78
  4. Step 4: Simplify right side
    739.90x = 540,693.47
  5. Step 5: Solve for x
    x = 540,693.47/739.90
  6. Step 6: Final answer
    x = 730.77

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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.