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Finding the Fourth Proportional to 398,139.40, 596,402.70 and 247,918.60

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Solution

The fourth proportional to 398,139.40, 596,402.70 and 247,918.60 is: 371,375.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,139.40 : 596,402.70 = 247,918.60 : x
  2. Step 2: Convert to fraction form
    398,139.40/596,402.70 = 247,918.60/x
  3. Step 3: Cross multiply
    398,139.40x = 596,402.70 × 247,918.60
  4. Step 4: Simplify right side
    398,139.40x = 147,859,322,420.22
  5. Step 5: Solve for x
    x = 147,859,322,420.22/398,139.40
  6. Step 6: Final answer
    x = 371,375.76

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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.