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Finding the Fourth Proportional to 387,720.88, 581,608.96 and 103,409.81

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Solution

The fourth proportional to 387,720.88, 581,608.96 and 103,409.81 is: 155,122.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,720.88 : 581,608.96 = 103,409.81 : x
  2. Step 2: Convert to fraction form
    387,720.88/581,608.96 = 103,409.81/x
  3. Step 3: Cross multiply
    387,720.88x = 581,608.96 × 103,409.81
  4. Step 4: Simplify right side
    387,720.88x = 60,144,074,333.91
  5. Step 5: Solve for x
    x = 60,144,074,333.91/387,720.88
  6. Step 6: Final answer
    x = 155,122.09

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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.