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Finding the Fourth Proportional to 739.02, 1,020.15 and 499.80

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Solution

The fourth proportional to 739.02, 1,020.15 and 499.80 is: 689.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    739.02 : 1,020.15 = 499.80 : x
  2. Step 2: Convert to fraction form
    739.02/1,020.15 = 499.80/x
  3. Step 3: Cross multiply
    739.02x = 1,020.15 × 499.80
  4. Step 4: Simplify right side
    739.02x = 509,870.97
  5. Step 5: Solve for x
    x = 509,870.97/739.02
  6. Step 6: Final answer
    x = 689.93

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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.