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Finding the Fourth Proportional to 739.50, 1,019.10 and 621.57

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Solution

The fourth proportional to 739.50, 1,019.10 and 621.57 is: 856.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    739.50 : 1,019.10 = 621.57 : x
  2. Step 2: Convert to fraction form
    739.50/1,019.10 = 621.57/x
  3. Step 3: Cross multiply
    739.50x = 1,019.10 × 621.57
  4. Step 4: Simplify right side
    739.50x = 633,441.99
  5. Step 5: Solve for x
    x = 633,441.99/739.50
  6. Step 6: Final answer
    x = 856.58

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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.