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Finding the Fourth Proportional to 387,390.80, 580,753.37 and 134,638.46

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Solution

The fourth proportional to 387,390.80, 580,753.37 and 134,638.46 is: 201,842.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,390.80 : 580,753.37 = 134,638.46 : x
  2. Step 2: Convert to fraction form
    387,390.80/580,753.37 = 134,638.46/x
  3. Step 3: Cross multiply
    387,390.80x = 580,753.37 × 134,638.46
  4. Step 4: Simplify right side
    387,390.80x = 78,191,738,703.42
  5. Step 5: Solve for x
    x = 78,191,738,703.42/387,390.80
  6. Step 6: Final answer
    x = 201,842.01

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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.