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Finding the Fourth Proportional to 739.53, 1,020.45 and 440.70

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Solution

The fourth proportional to 739.53, 1,020.45 and 440.70 is: 608.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    739.53 : 1,020.45 = 440.70 : x
  2. Step 2: Convert to fraction form
    739.53/1,020.45 = 440.70/x
  3. Step 3: Cross multiply
    739.53x = 1,020.45 × 440.70
  4. Step 4: Simplify right side
    739.53x = 449,712.32
  5. Step 5: Solve for x
    x = 449,712.32/739.53
  6. Step 6: Final answer
    x = 608.11

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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.