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Finding the Fourth Proportional to 387,392.94, 580,756.56 and 134,640.59

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Solution

The fourth proportional to 387,392.94, 580,756.56 and 134,640.59 is: 201,845.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,392.94 : 580,756.56 = 134,640.59 : x
  2. Step 2: Convert to fraction form
    387,392.94/580,756.56 = 134,640.59/x
  3. Step 3: Cross multiply
    387,392.94x = 580,756.56 × 134,640.59
  4. Step 4: Simplify right side
    387,392.94x = 78,193,402,980.99
  5. Step 5: Solve for x
    x = 78,193,402,980.99/387,392.94
  6. Step 6: Final answer
    x = 201,845.19

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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.