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Finding the Fourth Proportional to 387,406.40, 581,109.60 and 137,998.40

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Solution

The fourth proportional to 387,406.40, 581,109.60 and 137,998.40 is: 206,997.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,406.40 : 581,109.60 = 137,998.40 : x
  2. Step 2: Convert to fraction form
    387,406.40/581,109.60 = 137,998.40/x
  3. Step 3: Cross multiply
    387,406.40x = 581,109.60 × 137,998.40
  4. Step 4: Simplify right side
    387,406.40x = 80,192,195,024.64
  5. Step 5: Solve for x
    x = 80,192,195,024.64/387,406.40
  6. Step 6: Final answer
    x = 206,997.60

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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.