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Finding the Fourth Proportional to 718.69, 993.09 and 620.27

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Solution

The fourth proportional to 718.69, 993.09 and 620.27 is: 857.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.69 : 993.09 = 620.27 : x
  2. Step 2: Convert to fraction form
    718.69/993.09 = 620.27/x
  3. Step 3: Cross multiply
    718.69x = 993.09 × 620.27
  4. Step 4: Simplify right side
    718.69x = 615,990.61
  5. Step 5: Solve for x
    x = 615,990.61/718.69
  6. Step 6: Final answer
    x = 857.10

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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.