Home / 427,918.55-641,979.14-139,728.78

Finding the Fourth Proportional to 427,918.55, 641,979.14 and 139,728.78

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Solution

The fourth proportional to 427,918.55, 641,979.14 and 139,728.78 is: 209,626.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    427,918.55 : 641,979.14 = 139,728.78 : x
  2. Step 2: Convert to fraction form
    427,918.55/641,979.14 = 139,728.78/x
  3. Step 3: Cross multiply
    427,918.55x = 641,979.14 × 139,728.78
  4. Step 4: Simplify right side
    427,918.55x = 89,702,961,319.01
  5. Step 5: Solve for x
    x = 89,702,961,319.01/427,918.55
  6. Step 6: Final answer
    x = 209,626.25

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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.