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Finding the Fourth Proportional to 257,812.80, 387,010.80 and 139,423.20

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Solution

The fourth proportional to 257,812.80, 387,010.80 and 139,423.20 is: 209,292.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    257,812.80 : 387,010.80 = 139,423.20 : x
  2. Step 2: Convert to fraction form
    257,812.80/387,010.80 = 139,423.20/x
  3. Step 3: Cross multiply
    257,812.80x = 387,010.80 × 139,423.20
  4. Step 4: Simplify right side
    257,812.80x = 53,958,284,170.56
  5. Step 5: Solve for x
    x = 53,958,284,170.56/257,812.80
  6. Step 6: Final answer
    x = 209,292.50

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1.5x scale

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.