Home / 257,972.16-387,069.12-139,728

Finding the Fourth Proportional to 257,972.16, 387,069.12 and 139,728

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Solution

The fourth proportional to 257,972.16, 387,069.12 and 139,728 is: 209,652.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    257,972.16 : 387,069.12 = 139,728 : x
  2. Step 2: Convert to fraction form
    257,972.16/387,069.12 = 139,728/x
  3. Step 3: Cross multiply
    257,972.16x = 387,069.12 × 139,728
  4. Step 4: Simplify right side
    257,972.16x = 54,084,393,999.36
  5. Step 5: Solve for x
    x = 54,084,393,999.36/257,972.16
  6. Step 6: Final answer
    x = 209,652.06

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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.