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Finding the Fourth Proportional to 1,268,728.90, 1,750,684.57 and 724,899.91

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Solution

The fourth proportional to 1,268,728.90, 1,750,684.57 and 724,899.91 is: 1,000,269.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,268,728.90 : 1,750,684.57 = 724,899.91 : x
  2. Step 2: Convert to fraction form
    1,268,728.90/1,750,684.57 = 724,899.91/x
  3. Step 3: Cross multiply
    1,268,728.90x = 1,750,684.57 × 724,899.91
  4. Step 4: Simplify right side
    1,268,728.90x = 1,269,071,087,231.39
  5. Step 5: Solve for x
    x = 1,269,071,087,231.39/1,268,728.90
  6. Step 6: Final answer
    x = 1,000,269.71

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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.