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Finding the Fourth Proportional to 387,638.99, 581,458.53 and 121,420.27

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Solution

The fourth proportional to 387,638.99, 581,458.53 and 121,420.27 is: 182,130.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,638.99 : 581,458.53 = 121,420.27 : x
  2. Step 2: Convert to fraction form
    387,638.99/581,458.53 = 121,420.27/x
  3. Step 3: Cross multiply
    387,638.99x = 581,458.53 × 121,420.27
  4. Step 4: Simplify right side
    387,638.99x = 70,600,848,593.36
  5. Step 5: Solve for x
    x = 70,600,848,593.36/387,638.99
  6. Step 6: Final answer
    x = 182,130.41

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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.