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Finding the Fourth Proportional to 739.69, 1,020.81 and 425.02

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Solution

The fourth proportional to 739.69, 1,020.81 and 425.02 is: 586.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    739.69 : 1,020.81 = 425.02 : x
  2. Step 2: Convert to fraction form
    739.69/1,020.81 = 425.02/x
  3. Step 3: Cross multiply
    739.69x = 1,020.81 × 425.02
  4. Step 4: Simplify right side
    739.69x = 433,864.67
  5. Step 5: Solve for x
    x = 433,864.67/739.69
  6. Step 6: Final answer
    x = 586.55

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1.5x scale

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.