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Finding the Fourth Proportional to 867,062.40, 1,299,718.80 and 394,087.20

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Solution

The fourth proportional to 867,062.40, 1,299,718.80 and 394,087.20 is: 590,733.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    867,062.40 : 1,299,718.80 = 394,087.20 : x
  2. Step 2: Convert to fraction form
    867,062.40/1,299,718.80 = 394,087.20/x
  3. Step 3: Cross multiply
    867,062.40x = 1,299,718.80 × 394,087.20
  4. Step 4: Simplify right side
    867,062.40x = 512,202,542,679.36
  5. Step 5: Solve for x
    x = 512,202,542,679.36/867,062.40
  6. Step 6: Final answer
    x = 590,733.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.